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"
by CockAdoodleDoo!! December 9, 2016
Get the Handvac mug.