a lick
A lick is when you get easy money. It could be stealing, hustling, or just getting lucky. It's like finding $20 on the ground and not telling anyone.
She got a lick by hustling at the train station. She made $100 in 10 minutes.
He got a lick by bartering for a car. He got it for half the price.
I got a lick by finding $50 on the floor. I didn’t even tell my brother.