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A buttgig, is when somebody has had so much anal sex, it's almost as if the amount of people that would attend a rock concert, have been inside the person's arse.
Richard: wow, she loves anal!
Alex: But is it like a buttgig in there?
Nick: Man, he fucking loves getting bummed
Isaac: Serious buttgig going on right there.
by StumblingAlloy May 15, 2012