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A slang usage to define two gay lovers who partake in eachothers anus in acts of love or lust.
"Hey Michael, you and your butt-pal should stop watching Sex in the City and come watch the Super Bowl."

"Hines Ward is most certainly a butt-pal with Ben Roethlisberger, just look at the way he smiles."
by The Angry Penguin February 01, 2009