someone with seemingly unlimited energy and/or endurance

he keeps going and going and going and going and going and going and going and going and going and going and going and going and going and going and goingand going and going and going and going and going and going and goingand going and going and going and going and going and going and goingand going and going and going and going and going and going and goingand going and going and going and going and going and going and goingand going and going and going andand going and going and going and going and going and going and going going and going and going and goingand going and going and going and going and going and going and goingand going and going and going and going and going and going and goingand going and going and going and going and going and going and goingand going and going and going and going and going and going and goingand going and going and going and going and going and going and going

A male in his teens or early tweeties who is either unexperienced with sex or just lacks any form of technique. He just jabs in and out hard and fast with no concern for the pleasure of his partner.

A perpetual motion machine.

when a boy is playing video games and 1 or more females are sucking him off

Someone who will never quit trying. They won't give up. Much like the Energizer Battery's Mascot, they just keep going and going and going and going....

When something is so funny, that the laughter goes on and on and on.