Picking up the full share of what would normally be a split bill for a meal, only to have the other person pick up the bill at a later date. Fully appropriate when in a pinch for cash and you are still hungry.
That cheap bastard Dan couldn't pay for his pizza logs, well food karma is a bitch and he'll be paying for my drinks next week.
When you eat something delicious only to feel it later that day or the next morning. Most commonly associated with hot wings and cheap fast food.
Man, Roy Rodgers was great last night but food karma really took it out on me this morning.