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The fan-shaped patch of hair just above a guy's butt.
He's got as much hair on his fantail as he has in his crotch.
by Evan69 August 15, 2010
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Aug 11 Word of the Day
A phrase to describe someone who is cognitively degenerating. Synonym of "going off the deep end". Can have varying degrees of severity.

Reference to the song "Hey You" by Pink Floyd. The line "and the worms ate into his brain" makes no sense in an otherwise linear and literal narration throughout the lyrics.
"My boyfriend has a total case of brain worms. He told me the cat was bugged so the Feds could listen in on us having sex..."

or

"You totally stumbled over that entire sentence. Can't speak English all of a sudden? What, do you have brain worms?"
by _Jez_ October 03, 2009
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3
A guy or girl who has a stupid hangin on their nuts..

Dude that beoch is just a faintail.
by Anonymous July 27, 2003
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