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After a woman gives a man oral, she doesn't spit or swallow-- she proceeds to kiss the man and give him his cum back.
"Dude after Stacy blew me, she gave me a cumback-- I didn't know it was that salty!"
cumback by JuJuLaylayRiRi April 2, 2009

The cumback 

When a guy blows a load in his partners mouth and after it's done, the partner comes up to kiss him, and the partner spits the load back into the unsuspecting guys mouth.
Aj: "God damn, Morgan gave me the cumback last night!"
Rome: "I bet you liked that mouthful of baby gravy faggot!"
The cumback by Shaniqua jones ;) August 24, 2011

cumbacker 

A woman who has sexual intercourse which concludes with ejaculation on her back side. Usually as a sign of disrespect and/or due to cosmetic defects on the front side of one's body (i.e. the face or breasts), cumbacker is often used as an ironic pun as the male will rarely come back once he is spent.
Sally knew she was a cumbacker when Johnny ejaculated onto her back and left without saying good-bye.
cumbacker by Kalen Williams February 5, 2005
When a girl throws up cum right after swallowing.
Macie: *Swallows Intensely * That tasted like fucking acid

*Proceeds to throw up guts*
Dale: Wow what a fucking cumback
Cumback by NovaPvP June 5, 2018

The Immaculate Cumback 

the act of anal sex with an ex-girlfriend and after the sex you come on her back
I was drunk at a party and i hooked up with my ex and gave her the immaculate cumback.
The Immaculate Cumback by Pang™ October 4, 2006
When a washed up celebrity is made temporarily famous again by their participation in an "accidentally leaked" sex tape.
Did you see Dustin Diamond's three-way? He's gonna have a major cumback this week.
cumback by skomand December 14, 2007