Top Definition
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.
dari Sega Slayer Minggu, 28 September 2003

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Something that can kill you. Fast. Like me.
SHIT MAN! That axe is deadly!
dari Your Ass Minggu, 28 September 2003

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incredibly ill performance of a smoking tool(referring to bud)
"Yo, that bong is deadly!"
dari ILL SILVS Jumat, 12 Maret 2010

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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."
dari Kitty-Kat-Killer(KKK) Senin, 29 September 2003

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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!
dari mooshi800 Senin, 20 April 2009

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Life threatening
Don't drink the poison, as it is deadly.
dari Paul Senin, 29 September 2003

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To "get deadly" means to take ecstasy.
Guy 1: hey Seánhead, are you gettin' deadly tonight?

Seánhead: I'm quite clearly off my face
dari Samwab Sabtu, 05 April 2008

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