Doing an unasked-for favor for someone, and then using it to try and guilt them into doing something for you.
Sam: "So Bob shows up at my house randomly with some brown bananas and is like 'hey, you can use these to make banana bread,' and I'm like 'uh, ok, I don't really bake but thanks,' and then he invites himself in for an hour and asks to borrow $300."

Joe: "That's some prime favor sharking right there. But my mother in law is worse. She keeps buying us weird vases and knick-knacks we don't need and then calls us ungrateful if we don't spend hours on the phone with her saying thank you and talking about where we'll put them in the house. We keep asking her to stop but she won't.
by Mai Ainsel June 17, 2020
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Someone who does favors for you without being asked, then proceeds to guilt trip you or strongly implies you owe them something.
"hey man I helped you sell that car, you owe me the next up on the lot"

"i didnt ask for assistance, you swept into help me so you could demand my help, fucking favor shark"
by BotchoMan January 29, 2019
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