An experienced bottom who loves cock so much, he wants to get pounded as roughly & aggressively as possible. The harder the better. He can take it like a champ with no pain. A power bottom doesn't just passively lay there, he pushes back on every thrust from the top. Sometimes he'll do all the work and ride the top like a mechanical bull until they both explode with ecstasy.
"I hooked up with Ricky last night. Dude was wasted, so he just laid there while I did the power bottom thing. I rode him until he busted inside me. It was so hot!!!"