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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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Nov 27 Word of the Day
A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.
That fucking smooth brain put his shirt on backwards again...

That smooth brain is dumber than a pile of shit.
by Tip Tank May 14, 2011
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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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