Owed money that over time causes bad blood. Usually it is a significant sum which is borrowed but it can be smaller sums if there is a perceived sheisty intent. Acrimoney is the reason caution is advised when lending as often times debt is one of the few slights that can break up tight friendships or family relationships. Especially if the lender is a known money bitch.

when you're hungover as shit after a spending a night drunk as a skunk