Dictionaries:

Bill Grundies:

British rhyming slang for undies , undergarments.
See Also: bent as a nine bob note, big legs, billie-coo, camp as a row of tents, crack-a-boo, dick weed, gay rights, give someone a melvin, queer as a football bat, queer as a nine bob note, queer as a square egg, three-dollar bill

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