to masturbate... to do the the dirty deed, in a few words to deal with your sexual needs by yourself

Spanking the Monkey is another term for masturbating, otherwise known as beating your meat, slapping the ham, tugging the tiger, jerkin the gerkin, or stroking the sausage.

waxing the carrot, choking the bishop, jacking the beanstock, yankee-ing the doodle,peting the one eyed wonder weasel, waxing the wood, caulking the cracks, jacking off, wanking.

When a man masterbates or strokes his penis

Taking things in to your own hand or a hand trusted by you.

When you own a giant stuffed monkey and spank him.