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1.
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.
von Sega Slayer 28. September 2003
 
2.
Life threatening
Don't drink the poison, as it is deadly.
von Paul 29. September 2003
 
3.
Something that can kill you. Fast. Like me.
SHIT MAN! That axe is deadly!
von Your Ass 28. September 2003
 
4.
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."
von Kitty-Kat-Killer(KKK) 29. September 2003
 
5.
To "get deadly" means to take ecstasy.
Guy 1: hey Seánhead, are you gettin' deadly tonight?

Seánhead: I'm quite clearly off my face
von Samwab 5. April 2008
 
6.
incredibly ill performance of a smoking tool(referring to bud)
"Yo, that bong is deadly!"
von ILL SILVS 12. März 2010
 
7.
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!
von mooshi800 20. April 2009