B-diesel
A person who has no job and still thinks they're the best thing since sliced bread and takes everything from their friend or partner.
My dad's a B-diesel. He took my money and still acts like he's my best friend.
She's a B-diesel. She took my phone and still says she's going to pay me back.
He's a B-diesel. He took my last pizza and now he's eating it like it's the best thing in the world.