bath bun:

British / Cockney rhyming slang for a son.
See Also: ablutolagnia, ablutophilia, ablutophobia, bathing beauty, Bathsheba, bikini, bun woman, Bunjamin, church, do the grand tour, grand tour, Our lady of the vapor(s), P.T.A., pig room, split some buns, split someone's buns, three B's

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