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A term used to describe the edge or brink of something. Used very often when describing where something lies and/or is near.
My golf ball is on the cusp of the green!
that wonderful business man is on the cusp of success.
by cleverman November 03, 2012
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The vengeful act of crapping on a lover's chest while they sleep.

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2
in and of or around the brown eye of your butthole, the circular lemon-sucked area surrounding it is the Cusp.Literally the Cusp of your poopshoot! Usually used to degrade woman by having them commit a sexual act off of it.
"I made that bitch eat A FRIED egg off of my Cusp! Everytime I farted that white yolk flapped on the CUSP!
by Pepe305 September 08, 2006
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3
Meaning highest point or pinnacle in traditional English language. Also used commonly by those suffering from severe, delusional, narcissistic, psychosis!
"I am a chicken!...I am the king of the world!...I am the cusp!"
by Supras R Weak October 29, 2005
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4
used to describe the brim of a solo cup while playing beer pong. it can also be used as a distraction word referred to the origional defination of a butthole.
"right off the fucking cusp!"
by thematster1 July 23, 2008
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5
A word defined crudely by a couple of high school students bored in AP Calculus. To cusp someone is to participate in a sexual fantasy in that persons mind.
I cusped your mom. (I participated in a sexual fantasy in your mother's mind)
by Some Transmitted Disease November 30, 2004
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