1.To borrow or bum an item with great frequency, instead of just buy one's own. Example, cigarettes.
2. To pawn off one's responsibilities.
Upstanding gentleman of leisure- Fuck no douche, you shirked a whole pack from me last week.
2. Random gentleman- Hey man are you going to take out that trash?
Shirker- Naw man, I'll just shirk it off on the fuckin new guys.