something very stupid or unpleasurable. Usually used to discribe a unfortunate event.
Tron: man bro that bitch want me to take her to applebees and get the steaks !!!

Will: that's DEADLY!
by brad piff January 21, 2011
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To drive(by yourself) 6-999,999,999,999,999,999,999 both legal and new Bentley motor vehicles at a time without any help WHATSOEVER.
Wow, that kid really is, deadly.
by not legally GTA_DEADLY August 27, 2023
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"Hey sis, that band last night was deadly"
by Attika November 7, 2018
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(Me) “ hey cousin i think your deadly

(Cousin) “ naaaaaa Holayyy Assssifffff”
by Half native boy December 9, 2019
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incredibly ill performance of a smoking tool(referring to bud)
"Yo, that bong is deadly!"
by ILL SILVS March 12, 2010
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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 21, 2009
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Something that can kill you. Fast. Like me.
SHIT MAN! That axe is deadly!
by Your Ass September 29, 2003
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