The use of a pig as an unorthodox method of transport made famous by the working classes of Great Britain. Often riding to and from the pub 'two-a-pig' has made the mobile pig's back a common place for coitus.
Steve: Who's that bumhummit over there?
Bo-vice: That's Paul......his parents are heavy drinkers.
Steve: Oh, is that the guy whose parents conceived him whilst pigback?
Bo-vice: Yeah
Steve: Jesus, you think they could have at least pulled over.
by gregtastic October 7, 2010
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