What is Pipe Down?
1.
basically telling someone to shut up.
"hey you over there, pipe down"
2.
Originally a naval expression. It means stop talking and be quiet. The Pipe Down was the last signal from the Bosun's pipe each day which meant "lights out" and "silence".
You better pipe down when she's talking to you!
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3.
A uncomplicated and cutting expression, which plainly means "Shut the Fuck Up"
"My fiancee is demanding I go to bed before 12"
"Tell the bitch to pipe down..."
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4.
To
I was piping down this bitch last night when, all of a sudden, her roommate walked into the room. Then I piped her down too.
5.
v. to have sexual intercourse with a female
I piped down this chick last night for three hours.