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.
بواسطة Sega Slayer سبتمبر/أيلول 28, 2003
Something that can kill you. Fast. Like me.
SHIT MAN! That axe is deadly!
بواسطة Your Ass سبتمبر/أيلول 28, 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."
بواسطة Kitty-Kat-Killer(KKK) سبتمبر/أيلول 29, 2003
Life threatening
Don't drink the poison, as it is deadly.
بواسطة Paul سبتمبر/أيلول 29, 2003
incredibly ill performance of a smoking tool(referring to bud)
"Yo, that bong is deadly!"
بواسطة ILL SILVS مارس/آذَار 12, 2010
To "get deadly" means to take ecstasy.
Guy 1: hey Seánhead, are you gettin' deadly tonight?

Seánhead: I'm quite clearly off my face
بواسطة Samwab إبريل/نَيْسان 5, 2008
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!
بواسطة mooshi800 إبريل/نَيْسان 20, 2009

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