knock boots

Perhaps from the notion that boots placed beneath one's bed knock one another due to the shaking of the bed during sex.

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knock boots (third-person singular simple present knocks boots, present participle knocking boots, simple past and past participle knocked boots)

1. (slang, euphemistic) To have sexual intercourse, especially recreationally if not casually.
   • 1986, “Tramp”, in Hot, Cool & Vicious, performed by Salt-n-Pepa:

     You ain't knocking boots/ You ain't treating me like no prostitute

   • 1994, Marshall Crenshaw, Hollywood Rock, HarperPerennial, published 1994, →ISBN, page 250:

     Of course they fall madly and deeply in love, as Biker Dude learns to respect a girl who won't knock boots on the first date.

   • 2016 February 14, Joseph Adenuga, Darren Dixon, Tariq Devega, “Ladies Hit Squad” (track 6), in Konnichiwa, performed by Skepta ft. D Double E and ASAP Nast, Boy Better Know:

     After we done, bill a spliff and cotch / Pour me a glass of the Henny on the rocks / And get ready for round two / Cause any time we knock boots you know we knock twice

• do it, get some, hook up, Netflix and chill; bump nasties, slap bellies; see also Thesaurus:copulate