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1.
The act of being or acting like a ballbag. When a person acts stupidly or does something completely idiotic. Also when someone makes themselves look like an asshole or bell-end in public.
Friend One: "Oh look, Billy just told that girl he really fancies that she has a moustache."

Friend Two: "Yep, his ballbaggery knows no limits!"
by El Noido February 04, 2011
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