The most incredible comeback to any argument. Telling your opponent to spell icup will instantly disable all of their bodily functions and render them udderly defeated. It is the key to the understanding of the universe and can destroy anything that dares to spell it.

Sounds like "I c (see) u (you) pee". Its also a joke used in Elementary school.

A lame joke told by 3rd graders and retarded 6th Graders.

A cringy joke made by 2nd graders.

I.C.U.P or in other words "I see you pee."

A new product developed by Apple. Improving on the iPod, now one is able to not only listen to music and watch movies, but iCup also allows the user to see through bathroom stalls and doors.

Mostly told by elementary school students. The joke is that if someone spells "ICup", they sound like they are confessing to watching someone pee.
I C(See) U(You) Pee.