ripley
When a man fucks a woman and you can see his cock head pushing up into her abdomen.

Called this because it looks like an alien is about to push out of her stomach like what happened to Ripley in the movie Aliens.
Girl 1: So what happened last night with Dom?

Girl 2: Oh, it was so good. He gave me a ripley and when I saw his cock protruding from my stomach I came instantly.