When the banjo string (between the bellend and the forskin) snaps while having sex.
Snapping the banjo- "The man snapped his banjo string last night"
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where the skin between his bell-end and foreskin is ripped away while having sex
no need for an example for snap his banjo
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snapped banjo is a mans snapped boner.
Oh look, Jhonny has a snapped banjo
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