Where a male puts his dick between a woman's breasts.
Frank: "Bro, look at that girl's tits!"
Bryan: "Who, Kayla? I rack mounted her last weekend. Damn good."
by TimmytheSlamMan February 6, 2017
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The phrase "Rack mount professional" , implies in a sarcastic manner, that if a piece of audio equipment is rack mounted into a equipment rack, it must be of pro quality.
Items that are considered to be "rack mount professional" :

Rack mount pyramid amplifiers are awsome.

Rack mount behringer compressors are state of the art...
by big n.s. February 17, 2009
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