go rump-splitting:

Of a male, to perform copulation with or to a woman . See copulation for synonyms.
See Also: ambibombe, assaroonie, backland, canister set, croup, gluteal region, rusty-dusty, sit-me-down, south-end, split some buns, split someone's buns, split-mutton, squatter, stern, tail end, tawse, tockus, tokis, tokus, tooky, western end

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