Top Definition
The essence of one who's a badass motherfucker.
Adjective: Shit man you been Kilcoyne'n lately?

Noun: Didn't that Kilcoyne fuck your sister last week?
by Ben Dovers April 05, 2008
a pale skinny male who gets easily heartbroken
You're sucha Kilcoyne
by CRIMDELACRIM August 06, 2007

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