1. Adjective used to covertly describe someone as an enormous douchebag.
2. Adjective used to convey a douchebag of immense proportions.
"Sweet IROC-Z Larry, that baby is as vinegargantuan as you are."
"You see Larry's new IROC? That guy isn't just a douchebag, he's a vinegargantuan douchebag."