A fork of Rural Dictionary
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!