fuckjack

Kind of like fucktard, fuckhead, stupid fucking idiot, only better since without the "retard" of connotation inherent in "fucktard" and not as lame as douchbag/douche, etc.

"How about those fuckjacks (n.) who try to force their entire torso into the subway doors before they close?"

Also, as a verb:

"to describe the action of jacking the subway door open and screwing everybody else. "I totally fuckjacked my way onto the train this morning, and then some dude in a cape took a boot to my sternum."