Describes something that has the power to make you dead.
It was a deadly mistake for Dan to go bowling that day. The mysterious guy who hates bowling killed him.

Sega made a deadly mistake with the Sega saturn. It died and was unpopular.

The venom of that snake is quite deadly.
door Sega Slayer 28 september 2003
Life threatening
Don't drink the poison, as it is deadly.
door Paul 29 september 2003
Something that can kill you. Fast. Like me.
SHIT MAN! That axe is deadly!
door Your Ass 28 september 2003
An adjective that means:

1. Can kill
2. Is able to kill
3. Yo' mamma
"This here snake is deadly, son. AHHH!!!"
"I fucked dealy last night."
door Kitty-Kat-Killer(KKK) 29 september 2003
To "get deadly" means to take ecstasy.
Guy 1: hey Seánhead, are you gettin' deadly tonight?

Seánhead: I'm quite clearly off my face
door Samwab 5 april 2008
incredibly ill performance of a smoking tool(referring to bud)
"Yo, that bong is deadly!"
door ILL SILVS 12 maart 2010
1. An Irish term for cool or awesome!

2. When something could kill you or is risky.
1. Irish Guy- Last night I went to a party! It was deadly man!

2. Guy-I saw a show on TV and some guy was gonna try bungie jumping with dental floss! It was sooo cool! I want to try!

Guy 2- Are you crazy! That's deadly!
door mooshi800 20 april 2009

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