Galaxy Back - Putting your cum on someone's back like it's a painting, and

Putting your cum on someone's back like it's a painting, and you're the most trashy artist in the whole universe.

My galaxy back was so good, my friend cried. He thought it was a real galaxy.

She did a galaxy back on me while I was sleeping. I woke up with a cum star on my neck.

He said he'd do a galaxy back on me if I gave him a high five. I did. He didn't hold up his end.