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(noun) Someone who loves anal sex so much, they'll bend over for any willing dick, regardless of circumstances. These people are also frequently dubbed asswhores, anal-whores, and politicians.
"Jon is such a buttramp! I saw him bent over, grabbing his ankles, and taking the captain of the football team's meat sword in his ass."

"Christa is a buttramp! The Owner fired her and the Department Manager when he caught them having anal sex in the office yesterday during lunch!"
by Chief of the Okhrana January 11, 2014