cum cups 

The dimples on a person's lower back right above the booty and on each side of the spine. Used to catch cum when a man unloads on your back/ass.

Damn, I'd like to fill her cum cups!

cum cups by IrishSprings February 7, 2017

Cum Cups 

Used to reference the anatomically modern female humans' dimples commonly found situated within the lower back region that corresponds to directly above the buttocks.

This word's creation/existence may be attributed to the potential for pooling of ejaculate within the aforementioned dimples upon employment of coitus interruptus birth control methods during acts of sexual intercourse that involve rear-entry position-type sexual positions -- such as doggy style.

"Look at those sweet little cum cups on that show-piece grade model of ass"
"Pulled out from behind and filled her cum cups up like a Polar Pop from the Circle K!"

Cum Cups by SleapEesyFam June 16, 2018