"Hey sis, that band last night was deadly"
by Attika November 06, 2018
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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!
by mooshi800 April 20, 2009
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(Me) “ hey cousin i think your deadly

(Cousin) “ naaaaaa Holayyy Assssifffff”
by Half native boy December 08, 2019
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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.
by King Parakeet November 21, 2018
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A word very commonly used by the irish to describe something beyond great.
Jamo's gaff is fuckin' deadly.
by Wezz November 17, 2004
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You came here just to see UD ask you if you want a deadly mug.
by yeltsA kciR May 30, 2021
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Australian aboriginal lingo for really excellent
"Hey check out my new jacket"
"Thats real Deadly".
by twiggywiggy August 29, 2009
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