Urban Dictionary: cum bun - Cum to bun
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A game played with many men in a circle racing to ejaculate onto a bun, cake or pastry, with the person last to ejaculate having to eat the bun, cake or pastry. Cum In A Bun 1. Noun- A guy ejaculating into a girl's hair and she leaves it in and proceeds to put her hair in a bun and wears the guy's cum.