Spankin' Gravy

When one ejaculates on the rear end of their partner and then proceeds to spank their rear end forgetting that they had ejaculated on it. In turn, spankin' gravy.

I can't believe I spanked my gravy last night!
We should spank some gravy tonight!
I'll definitely be spankin' gravy tonight.
Have you ever spanked gravy?
When are you going to let me spank my gravy?
I accidentally just spanked my gravy!
I can't believe mom didn't hear us spankin gravy last night!