An exhaust system that allows the exhaust gas to exit, while reducing back pressure. They use larger diameter
pipe than standard pipes.
"I just put catbacks on my Mustang, it's going to beast ass on all those civics and 'yotas out there."
by DKbikes October 27, 2007
large tip to an exhaust to release pressure build up from the car's gas.
The new catback i got for my tC will rape the other guy's mustang who also defined catback
by tCDanny December 22, 2009
Another term for Vagina, refering to intercourse.
Son- Man dad, I'm so bored.

Dad- Well get your ass out of the house and go get you some cat back.
by Marshal Clark March 12, 2008

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