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 1, 2009
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Two gay boys who haven't come out go into the bathroom together and preform homosexual acts on each other. Usually friends that nobody knows are gay.
Hey , did you see where Jake and Trevor went?
They just went in to the bathroom, the must be butt pals.
by Billythekid August 16, 2016
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