1 definition by Mountain Club

Top Definition
What you leave in the toilet after a day of heavy eating, possibly the result of extreme constipation.

Sometimes thought of as a competitive achievement, as in: "check out my water topper"
A "water topper" is an island, but in the toilet.
by Mountain Club September 09, 2009
Free Daily Email

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

Emails are sent from daily@urbandictionary.com. We'll never spam you.