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A jobless person who takes advantage of their partner or friend and acts like they're the best thing since sliced bread.
My ex is a B-diesel. She left me for a guy who can't even pay rent.
He's a B-diesel. He's been stealing my snacks for years and still acts like he's my best friend.
My sister's a B-diesel. She's been taking my money and pretending she's going to pay me back.