A idiot, douchebag, often named Drew, or Andrew. Often saved for extreme circumstances. Can still be used if the person is not named Drew or Andrew, but is less effective then.
Drew: FUCK YOU GUYS YOU TALKED ABOUT ME ASSHOLESFUCKFUCKFUCK Duncan: Calm down you Drewshbag, no we didn't.
-Later-
Dustin: Drew is a Drewshbag
Duncan: Yup.
This is ahuman being (questionably), male, with no soul, no heart, no brain, no conscience, no sense of humor, no concept of morality or loyalty, who also happens to enjoy licking moldy taint.