Flowbacking 

the act of pushing cum back into your girl with your fingers when it starts to run out

I didn't want to waste a drop of my cum so i started flowbacking her pu$$y

Flowbacking by niknack January 24, 2023

flowballing 

When a guy cums inside a chick's pussy, then eats her out, then spits the cum into her mouth & makes her eat it.

My mouth is still salty from all that flowballing - may I have a glass of water?

flowballing by babyvoodoo October 6, 2016

Flatbacking 

A bitch or bird with no job who sleeps around for money and material things.

Yo! How did Shawty get that Gucci Bag, she don't work even no where?

Ans: Shawty be flatbacking.

Flatbacking by V Double November 10, 2010

Blowbacking

Sliding your butt cheeks over an exhaust pipe and having your friend rev the engine. Usually for self pleasure but was used 20 years ago as torture in Guantanamo Bay.

Jimmy: What the hell is that burning smell...?
Andrew: I think its Daquan, him and his brother are blowbacking in his driveway.

Blowbacking by Lil_Mayo_Boi May 26, 2016

Flopjacking 

Sadly masturbating with a flaccid penis, when the hardness is fairly similar to that of a flapjack.

John is way too drunk tonight, no way is he closing with Mary. He'll probably end up going home alone and flopjacking.

Flopjacking by ValiantDonut738 October 23, 2017