The most common context is in a business setting when one party is trying to take advantage of another (i.e. "These guys are trying to buy us a steak dinner - they expect us to take it in the ass on that (negotiating) point.")
Bill: "Excellent, bought her a steak dinner."
Diego: "Hey Yves, how's your deal going?"
Yves: "Shitty, those guys are trying to buy me a steak dinner."