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!"
by joelh January 02, 2008
1 more definition
5 Words related to butt-welder
Rectal intercourse.
I was visited by a butt welder in the showers last evening.
by junior September 08, 2003

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