Top Definition
Adjective; a nickname or word used to describe a very adorable but stubborn boyfriend who knows his amazing girlfriend is right but is always being difficult at realizing this fact.
Girlfriend: Hey Baby! Look at this puppy it's so cute can we keep it?! I wanna name it Tyra <3

Boyfriend: No! We are not naming that dog Tyra. The only way that's happening is if that puppy is brown :)

Girlfriend: But I want a cute white puppy like this one! * shows pic

Boyfriend: no! The brown puppy or nuthin.

Girlfriend: ahhh fine you win Diffy. You're such a Diffy.
door Diffyluver69 30 april 2012
A slang term for clostridium difficile. Clostridium difficile has a very distinct smell.
Yo, did it smell diffy?
door ludawgg1234 12 maart 2015
A diffy is a term people use when they are high on drugs (any kind) an have a sudden urge to lick a butthole.
Jones: Wow, these drugs are really making me want to do a diffy right now.
Slim: I agree.
door Barstars905 17 juli 2016
'Deficient' - missing. Someone being diffy something will have lost of misplaced it. Usually a term related to and used by the British Army.
That soldier's diffy a pair of boots so he'll get billed for the loss.
door reme_critter 18 juli 2011
DIFFY: : lacking needful or desirable substance : weak, ineffectual.

Another word for: Retarded, Lame, Dumb, Boring, Stupid.
"Hey, dude. You going to Nate's party tonight?"

"I don't know, ,man. Last time I went over there it was pretty 'Diffy'."
door Metal Metal Rob Walsh 28 augustus 2010
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