Top Definition
When you shit so much that the pile breaks the surface of the water, forming a towering island of shit.
At truck stop...

"Dude, what took so long?"

"Sorry man, I was island forming again."
by TheSkinny July 18, 2008
Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.