cumswitch

When your giving your girl doggie while having your mate wanking secretly in the background and, right before you are about to cum, your mate takes over and spunks in your girlfriend's face

Tony: Oh dude, I had the greatest night of all time with Ethan
Oliver: What did you guys do?

Tony: Ethan and I performed a cumswitch with my girl. It was so funny
Oliver: That is so cool. Can I do it with you sometime as well?
Tony: Mate, you're a tranny. Don't you remember?
Oliver: shit yea