In essence, a bag of jerk.
Derived from the insults jerk, and dirtbag.
1.A mean person
2.What to call someone who is pissing you of at the moment
Marc: Matt, you're wrong.
Matt: You're right.
Marc: Stop agreeing with me.
Matt: Sorry Marc, Yo're Right.
Marc: SHUT UP JERKBAG! (punches him in chest)