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bum-stinger
[from King Island] the small cone of the Cupressus macrocarpa used as a projectile in 'fights games'. So called because when they hit one's buttocks they really stung: How did you get that bruise? I was hit by a bum-stinger.
Contributor's comments: As a child at school in Goulburn NSW we regularly had "bum-stinger" fights.