one who's bung hole is gapping, or largly streched out from taking huge dumps or large amounts of cock in the ass.
"Dave has been fucked up the ass so much he must have a gapping bung."
"Daves dad had a gapping bung after shitting him out"
"Daves dad had a gapping bung after shitting him out"
by z man zan August 11, 2009