An object or tool of sorts used for self fellatio..
Dude 1: "I can't my girlfriend to go down on me."
Dude 2:"You need a handvac bro."
Dude 1:"What the hell for??"
Dude 2:"So you can suck your own dick! Haha"
A combination of cartwheels and somersaults at high velocity whilst spraying shit within the fecal zone.
Girl:"Omg! What's that guy doing??"
Dude:"He's monkey rolling"
Girl2:"Oh my God I got sprayed by something."
Dude:"I would definitely suggest spitting and not swallowing on this one."