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based on a used welders bench, when welding lots of small lumps of metal fly of the object being welded as sparks and solidify on the bench giving it a spotted lumpy look. therefore a girl with a face like a welders bench is ugly, spotty, has a pock marked face, generally rough and not a pleasant sight
A: eeeuurrgh, that lucy's got a face like a welders bench
B: yeh she's well butters
by ontour February 29, 2012