A power is actually a clever combination of the words "poo" and "shower". Someone takes a power when they happen to poo and then shower without having to leave the bathroom.
Jerry: Hey man, what's going on?
Jack: Nothing much. I just took a power.
Jerry: Really? That's pretty badass.
Jack: I know, dude. I know. I take a power at least twice a day. It just makes sense. It's like my favorite thing to do.