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The act of sticking a finger up someone's bum during sex, either with their express request, reluctant permission, or (more amusingly) completely out of the blue. Applies to both gay and straight. Consider it a sort of polite alternative, or a beginner's version if you would, of fisting. It comes from the acronym FUB - Finger Up Bum. Derivatives like 'to fub', 'fubbed', 'well I'll be fubbed', 'fubstep' and so on are known to exist and are applicable according to context.
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