Hotdogging

Hotdogging is the act of placing a penis between the ass cheeks and pressing them against it -- sliding it between them in order to reach sexual satisfaction.

Alex: Hey babe, ever thought about hotdogging?
Sam: Hotdogging? That sounds kinky. What are you thinking?
Alex: I think it’d be hot to slide between your cheeks and see where it takes us.
Sam: Mmm, now you’ve got me excited. Let’s definitely try it.