An act of sexual gratification, performed by defecating in the vagina of a girlfriend's mother after you've decapitated her.
I totally pulled a koy last night and got myself so hot I jerked myself off into her neckhole.
by Dr. Stephen Gettig III July 18, 2003
one of the coolest chicks ever. She is a future therapist and can see everything, so dont lie to her
Koy, Koy, Koy
Your so crazy.
by makkaman May 21, 2004
Something so good and awsome that it defies explanation.
Ivan: OMG. Thats just....koy!
by Øyvind V January 14, 2009
A girl bestfriend. She will have your back and help you in times of needs. She will put others needs before her own.
You are so awesome; you should be my Koy.
by soft chunky lips February 05, 2010
A Iu Mien name sometimes named by Iu Mien parents so they could have a male child after the child named Koy. Also Koy is a female Iu Mien name. Also confused by the Koi fish.
Hey what's your middle name?
Koy
You mean Koy like the fish? As in -K-O-I-?
No as in Iu Mien Koy as in -K-O-Y-
Oh so not the Koi fish?
by MatchGirl April 10, 2012

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