Scumbaganitis is a medical condition known to many where the infected individual will have scumbagish qualities at all times. Such qualities include whining, crying, menstral cramps, jewing others over, and placing blame upon others for what the have done wrong.
Did you see Eric last night? He must have a severe case of scumbaganitis with the way he was acting.
My prof is such a scumbaguette! She told me my essay needed only one minor change to go from an A- to an A, and then she turned around and gave me a C- because I corrected her in class!
One who has reached levels beyond what the term scumbag can accurately represent. To reach the level of scumbag bitch, one must commit to a scum filled life, usually topped off by a single act of complete scum.