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Etymology
Possibly (or derived the other way around).

Verb

 * 1) to rock, to swing, to shake, to wobble; to dandle (once)
 * 2) to pump (once)
 * 3)  to toss, to roll, to pitch (once)
 * 4)  to lift up, to chair to toss someone up, like a group of fans their champion
 * 5)  to train/pump muscle (once)
 * 1)  to toss, to roll, to pitch (once)
 * 2)  to lift up, to chair to toss someone up, like a group of fans their champion
 * 3)  to train/pump muscle (once)
 * 1)  to train/pump muscle (once)