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1.
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.
av cleverman 3 november 2012
 
2.
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!"
av thematster1 23 juli 2008
 
3.
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!
av Pepe305 8 september 2006
 
4.
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!"
av Supras R Weak 29 oktober 2005
 
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)
av Some Transmitted Disease 30 november 2004