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1.
When one has sex with another and then leaves quickly after. Popularized in James Browns song, "Sex Machine".
Yo, I was just with Julie and I hit it and quit.
by AlejandroR March 20, 2012
 
2.
to use a guy for sex and then leave him ;)

"hit that ass"
and "quit" on your relationship with him.... who needs him for more than one night?
Guys are only good for two things....buying you shit and making you scream
yeah, hit it and quit babe, no other way around it
by eveingingstarts July 09, 2011