leaking the main drain:

Jocular coinage for male masturbation . See masturbation-male for synonyms.
See Also: basis, double, drain the main vein, favorite dish, Haemophilus vaginalis, leak, main avenue, main dish, main lady, main vein, old lady, sister-in-law, star of the line, strain the spuds, urination, wife-in-law

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