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Naturally produced lubrication during anal sex.
"Boy baby you have a lot of butt water"

"I enjoy drinking my boss's Butt Water at lunch time."

"I put creamer in my Butt Water."
by sid rock November 15, 2007
An ugly, hairy person who has no hygene.
Michael is the biggest buttwater in the world.
by Sexy Unanymous May 09, 2006