When a girl who has a boyfriend or husband goes out to a bar to find another guy to bang. It get its name because she has the lock and she's looking to find a new key.
by Zlats October 24, 2012

When you take a lime, cut it open and squeeze the juice into a woman's vigina. Afterwords you cum inside of her making it look like a key lime pie.
by Turbovec March 14, 2004

by Soiled Undergarment August 17, 2003

Keep your head up and don't give up on someone if they're rich. They can change for you if they really love you.
by qui33 for u March 1, 2019

A sexual practice in which a man ejaculates in either the vagina of a woman, or the anus of either a woman or a man and then inserts one or both of his testicles in to the semen filled orifice.
"I took my mom out for dessert tonight"
"What did you guys have?"
"Key lime pie."
"Awwww, gross dude"
-
"At the orgy tomorrow night I hope to get a little key lime pie while I'm giving a key lime pie of my own to that hot secretary, Trish."
"What did you guys have?"
"Key lime pie."
"Awwww, gross dude"
-
"At the orgy tomorrow night I hope to get a little key lime pie while I'm giving a key lime pie of my own to that hot secretary, Trish."
by Roberto!! September 2, 2009

A boy who you wouldn't suspect to be a fuck boy as they do not fit the stereotype. However they then surprise you by being a fuck boy, hence the 'low key' as they are unsuspected and on the down low but still turn out to be a waste of your time
by gracewell July 4, 2015

Multiple key changes in any sappy song used for dramatics and to manipulate emotions - an art especially exploited by Barry Manilow.
My choir director shouted out to us while we were singing, "Get ready for the Barry Manilow key change!"
by waterspout May 12, 2011
