Back paint

Busting a monstrous load of jizz on ones back!

I back painted Molly last night after she gave me road head from the bar!

back painting

the act of ejaculating on a back upon pulling out; cumming on the the back region

yesterday me and sarah got down and dirty, and then i gave her a back painting

Back in the painting

To be "Back in the painting" means falling back in your old habits. If you we're a portrait this act would be portayed.
Also used for more short sighted terms like when there is a bowl of candy on the table and you exclaim, i'll have no more and then two minutes later you are – indeed – back in the painting

I'll have no more candy now. (moments later the person eats more)
I'm/she/he is now "back in the painting"