Another word for wanking. It involves pulling the foreskin over and back and therefore yo-yo-ing is appropiate. Unless your circumsised.
'God! Adams loves to Yo-yo'
'Mum, i'm going to do sum yo-yo-ing'
Verb; the practice generally by the male species of tossing girls out when not needed only to yank them in when they so desire.
Tina didn't work out tonight so I'm yo-yo-ing sally.