have a knee-trembler

vulgar slang To engage in casual sexual intercourse while standing. Yeah, OK, we had a knee-trembler in the bathroom at the party. Nothing serious. Look at how disheveled they are! Oh my gosh, did they seriously have a knee-trembler in the powder room at our engagement party?

See also: have

See also:

trembler
knee-trembler
make the beast with two backs
get (one's) ashes hauled
have it off/away with somebody
Catholic roulette
Vatican roulette
roulette
pop the cherry

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