bone in the leg:

UK usage for an erect penis noticeable by the telltale bulge of the trousers. See penis for synonyms.
See Also: adolescent growth spurt, arse-bone, arse-wedge, ass-bone, ass-wedge, bone in the bum, bone the bum, coccyx, crus of the clitoris, crus penis, eenob, enob, gains, hear the call, ilium, jump bones, jump someone's bones, leg, manbone, pins, play the bones, wang bone, whang bone

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