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The act of ejaculating on your mates back after she has been unsuccessfully blowing you and begins to walk away while you quickly beat it and finish on her back.
Dorothy: "How was you night Inexperienced female friend?"
Inexperienced Female Friend: "Well I gave up and was about to leave him high and dry, but he made a nice Cum Back. I thought the game was over, but that buzzer beater took me by surprise."

Dave: "I was railing some bitch last night. She finished first, said thats it and began to walk out. I was so pissed i jerked it myself and made a quick Cum Back as she was leaving. Hope her dad finds it.
Cum Back by takeawalksir January 22, 2014
To suck the cum back up your dick like a straw.
I almost got Stacy pregnant but I used a cum back.
Cum back by TimboMD December 2, 2019
To wipe your cum off someones chin, or other body part
Bitch if i wanted a cum back I would wipe it off your chin.
Cum Back by Jake Wright December 14, 2008
When a man ejaculates into a woman’s throat then goes into for a kiss when the woman spits the cum back into his mouth
“my girl had a cum back last night”
cum back by bbbbldrizzaaay June 21, 2026

Cum back season 

All of April is when you are only allowed to cum on a females back during intercourse when you are about to nut.
Guy1: Dude is cum back season!!!
Guy2: yeah I celebrated it last night!!!
Cum back season by Poop mated March 10, 2022

Baby Cum Back 

Baby Cum Back is when a baby, typically 3-7 weeks old, starts developing flaky and dry skin on their back.
"Why is your baby's back so dry and flaky? Have you checked if he has Baby Cum Back?
Baby Cum Back by Quarketh April 21, 2020