Parts made by an outside firm to replace OEM (Original Equipment Manufacturers) parts. Commonly used in automotive purposes, but the aftermarket exists in virtually every industry.

In other words, these are NOT "Genuine <fill in name of manufacturer> parts." The quality of aftermarket parts can vary widely, some engineered to be better than the originals, some poorly fitting and otherwise inferior crap. Caveat Emptor when buying aftermarket parts! But sometimes when the original parts are discontinued or the manufacturer has gone out of business, the aftermarket may be your only choice.

NAPA and J.C. Whitney are two of the larger aftermarket auto parts suppliers.

Quality Discount Press Parts and AAA Press are pretty much the only aftermarket suppliers of note in the flexo printing industry.
by Old Radio Collector May 23, 2007
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A woman's breasts that have been augmented with plastic or silicone sugery
"Bill's wife's tits are definitely aftermarket"
by joe mcduffie June 13, 2007
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Hey did you get a chance to check out the aftermarket rack on that chick? Must've cost a stack of dead presidents.
by Blankford1 December 7, 2013
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Yeah, she has aftermarket wheels.
by Mtbr March 24, 2018
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When you are not born autistic, but slowly become autistic via emotional and/physical trauma, especially trauma to the head.
Zero: "I'm not autistic. I'm just brain damaged and my brain just don't think good no more."
Me: "Just like being autistic, but by outside influence. You hit your head so many times you became aftermarket autistic."
by BigBCC69 July 28, 2022
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When two people dreadlock their genital pubes with each other's, creating a bond as strong as the hair roots on each's upper genital area. Can also be called "Hairy Symbiote"
Bro1: I've been feeling so disconnected from the world recently...

Bro2 (down-to-earth guy): I'll help you back down bro, let's try the aftermarket umbilical cord"
by Zeval April 7, 2020
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