Top Definition
In a car, a seat heater that roasts your ass to the point where you think your cheeks are going to melt together.
friend - "Holy crap, dude, my new car has seat warmers, and they're total butt-welders!"
av joelh 2 januari 2008
Rectal intercourse.
I was visited by a butt welder in the showers last evening.
av junior 8 september 2003
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