pipe down

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium. Particularly: “apparently originally naval”)

The sex sense is related to lay the pipe.

• Audio (General Australian):

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pipe down (third-person singular simple present pipes down, present participle piping down, simple past and past participle piped down)

1. (idiomatic, intransitive) To be quiet; to refrain from being noisy.

   Synonyms: see Thesaurus:be quiet, Thesaurus:stop talking

   Antonym: pipe up

   Pipe down, children. I'm trying to work.

2. (transitive) To dismiss from muster, as a ship's company.
3. (slang, transitive) Of a man, to have penetrative sex with a woman.
   • 2019 December 23, Damont L. Diggs, Wait‎^[1], Lulu.com, →ISBN, →OCLC:

     G-money aggressively pulled Coco's hair, as he delivered powerful strokes to her love tunnel. He then slid his fingers in her mouth, as he continued to pipe her down. Coco sucked and licked G-money's fingers as she took the back shots like a soldier.

   • 2020 November 10, Ladell Parks, Heaven Empire‎^[2], Ladell Parks:

     Michael hurry up bro me and my girl wanna go home so I can pipe her down.

• downpipe