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A bocka was a punch to the upper arm, inflicted as punishment by a peer for minor misdemeanours at school. Also, bokka.
Contributor's comments: to punch someone on upper arm with knuckle to make limb stiff or produce bruise: "Sir, Jones just gave me a bokka."
Contributor's comments: At secondary school in Melbourne in the 1950s this was the word used for a sharp blow (typically inflicted with a knuckle) to the outer side of the upper arm, about level with the top of the bicep. I have no idea how it was meant to be spelled, as we never wrote it down.
Contributor's comments: I know of someone from the Mallee Wimmera region who would say 'no bokkas' after flatulating, to ensure that no-one would punch him in the arm after the act.