The act of shoving a salty pretzel stick into one's urethra in such a fashion that it causes intense discomfort (or pleasure) in the recipient.
Jimmy: I saw Todd bunging a boose by himself. He left his window open. I'm telling his crush at school.
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To insert a pretzel stick into someone else's urethra (The hole in the tip of your cock)
Bob "Hey Daniel, can I bung your boose?"
Daniel "No way dude I'm not into that kind of shit!"
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When a man sticks a pretzel down his urethra
I let my friends bung my boose .