deadly 

Life threatening

Don't drink the poison, as it is deadly.

deadly by Paul September 29, 2003

deadly 

To "get deadly" means to take ecstasy.

Guy 1: hey Seánhead, are you gettin' deadly tonight?

Seánhead: I'm quite clearly off my face

deadly by Samwab April 5, 2008

deadly 

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.

deadly by Sega Slayer February 10, 2007

Deadly 

Something that is as cool as it is "dangerous". Like that one kid who walks to school wearing shades, a black vest, and is hiding the dope in his locker. This word is for those living on the edge!

Woah bro, that car lookin real deadly.
Bruh, that song is sounding deadly.

Deadly by King Parakeet November 21, 2018

Deadly 

A word very commonly used by the irish to describe something beyond great.

Jamo's gaff is fuckin' deadly.

Deadly by Wezz November 17, 2004

Deadly 

To mean awesome, great, excellent. (Aboriginal, Irish)

aboriginal: deadly, right?
racist australian: shut it abo

Deadly by theblueytimes September 22, 2023

deadly 

Irish form of "Brilliant"

That film was bleedin' deadly

deadly by Cully April 1, 2003