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The top of the butt crack exposed when an attractive woman wears low cut pants.

Similiar to clevage.
"Look at that chicks buttage!"
by Clint Mallory February 02, 2005
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Buttage: getting it in, or consummating sexual acts with another.
"Dude, I got some major buttage last night. My bitch was all over me. Buttage."

"I hope my girl lets me get some buttage tonight!"
by Zebras&Friends March 23, 2010
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