(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!"
A person or person's ass predisposed to exceedingly loud expulsions of gas from the anal regions. Usually refers to a temporary condition of said effects.
See also 'magical buttrumpet'.
'Man, I got mad buttrumpet today, must be the beans'
'You've allways got buttrumpet stinkhead!'