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 benchgiving 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
Mary- because Susan they all have huge cocks and they will suck your clit like a Hoover vacuum , not to mention they make more money and are a lot more attractive.
Often used to describe an exceptionally ugly face. Reminds us of the pitted, uneven mess formed by molten metal dripped by a welder onto his workstation.