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To want sexual intercourse with another. Usually used on a first meet.
person a: ah man, that girl is fit!
person b: oh yeah, buff, I'd belay that.
person a: mmm, she'd get belay anyday.
belay by ~ club penguin m8 ~ July 20, 2012
used in technical theatre to describe twisting the ropes of a rail system with a belay pin to keep the lineset from moving while weights are being added or taken off, usually only done when the lineset will be significantly arbor or batten heavy. comes from the nautical term to belay.
I need you to belay lineset nine.
belay by AliyaDaimhin January 23, 2017
(verb)
a) To touch oneself, to touch another, or to be touched by another, in the inappropriate sense of the word.
b) To get off.
a) He's hot, I'd like to belay him.
b) Man, it's been 4 days since I last belayed!
Belay by dbiz May 1, 2007
The name Belay is primarily a male name of African origin that means Above, Superior.
Have you seen that guy today?

You mean Belay? Better not mess with him. He’s superior!!
Belay by Potato dinich November 21, 2021

Belay On 

Often used as a climbing term the phrase "Belay on" can also be used in regular conversation to let someone know they have YOUR permission to proceed on with whatever they are doing or about to do.
Roommate 1: "Dude I'm gonna go drop a duece, ok?

Roommate 2:"Belay on, Bro."

Or

Roommate 1: "Hey man I think I'll take out the trash tonight."

Roommate 2: "Belay on."
Belay On by Rasswipe December 8, 2010

Belay Slave 

A belay slave is someone you've hired for the day (usually payment in beer, weed whatever) to belay you while you work on a rock climbing project.
Frank was my belay slave all weekend til I finally connected the last two moves on that 5.13+.
Belay Slave by jcastle February 2, 2009