(supplementary) The *upward* nod of acknowledgement has quite different connotations to the *downward* nod of acknowledgement.
The user of the *upward* nod of acknowledgement displays the nostrils and their contents to the subject, whilst symultaneously looking down on them. It therefore signals disrespect.
The *downward* nodder looks up to the subject, displaying submission to them. It therefore signals respect.
door Jonners 19 oktober 2005
Top Definition
The nod of acknowledgement is a standard among guys as a way to let the person know that you see them, without having to resort to using words. Girls will generally not accept the nod of acknowledgement and opt for a wave of the hand and/or a smile, perhaps even accompanied by words. The nod of acknowledgement is a wordless conversation.

The only acceptable response to a nod of acknowledgement is another nod. If you speak, you have broken the point of such a gesture.
Situations in which the nod of acknowledgement may be used:
(1) Walking past a friend to class
(2) Catching a friend's eye across the room to say "hi" without verbally saying it
(3) Giving approval of a friend's actions
door David Fier 17 oktober 2005
The all fabled "nod of acknowledgement is an interesting phenomenon. It is, put simply a slight head nod exchanged between males. While its use is documented among females, it is a rare and condition specific phenomenon. While exchanged between friends who, for whatever reason may not want to acknowledge each other verbally, in some places of the world, it is a common greeting among strangers. For example, in the southern United States, it is very common to offer a head nod to another male as you pass each other or get caught glancing at each other. However, as you travel further north, the head nod disappears among unfamiliars. While taking a stroll in NYC, you'd be hard pressed to get any unfamiliar male to return a nod of acknowledgement while simply walking down the street.
Gary and his girlfriend step into the crowded living room, the party in full swing. They notice Tim and his girlfriend. Gary and Tim exchange a nod of acknowledgement across the loud and crowded room, and then return to scanning the party. The two girlfriends do something along the lines of squealing or waving or running to each other and immediately compliment each other's shoes.

2. Dale walks down the street. He passes some guy, and they exchange a nod of acknowledgement.

3. As Lars stands in line at the hardware store scoping out the others waiting in line, he inadvertently catches the eye of Sven, two isles over. They simply exchange a nod of acknowledgement and look away.
door Count Samula 19 oktober 2005
go by the above definition, but the nod of acknowledgement is sometimes accompanied by a slight raising of the eyebrows and a slight grin...kind of like "ahh, yes. i see what you are doing. good job. good job."
friend 1 sees friend 2 trying to chat up a girl from the other side of the room. friend one then proceeds to nod his head, with eyebrows slightly raised, and grin slightly grinning.
Friend 2: (thinking) Jim can see me talking to this girl...sweet. he's nodding and raising the eyebrows. sweet (nods back)
Friend 1: (nod of acknowledgement towards friend 1) (thinking) Mmmhmm. That girl is hot.
door b3c 19 oktober 2005
This has also been spoken as the "guy nod" due to the fact that only guys seem to be the ones that do this, and at ages from middle school on up.
Nod of acknowledgement can be seen when walking through the halls of a school, I guy sees a girl that he knows, and gives her the guy nod to acknowledge the fact that he sees her, but not to draw too much attention to either himself or the situation that's occuring
door Bofo 11 november 2005
when one redpilled dude recognises a fellow redpilled dude
the hipster gave a nod of acknowledgement to the dude in the Camaro as he pulled up for the red light
door robot me 11 31 juli 2016
Something done primarily by males who are in the same demographic.

A simple nod that a guy that gives to another guy that acknowledges the fact that they are both aware of each other and accept each other's presence. Usually done without any thought going into it, essentially a non-verbal message of acceptance.

I have no idea why we do this now that I think about it, it's like some primal need to tell each other that we aren't hostile. Maybe it has to do with alpha males or something, left over monkey shit like arm hair I guess.
*guy walks down hall by himself*
*second guy walks in opposite direction*
*look at each other and give a brief nod before passing*
Nod of Acknowledgement
door Unbiased Definitions 14 juli 2016
Nod of acknowledgement when you see someone and they see you and you both tilt your head forward towards the ground as if nodding your head yes acknowledging that you have seen them
Tom sees Sally and nods his head in acknowledgement a.k.a nod of acknowledgement
via giphy
door Little hula 2 augustus 2016
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