a Waldi
A Waldy is the guy who pays with a credit card but only pays part of the bill, then takes the cash and steals the tip. He’s a cash thief and a total idiot.
He paid $10 for a $20 meal and took the $5 tip like it was his money.
He said, 'I’m paying!' but only paid for his burger.
He took the tip and left the rest of the bill on the table like it was a challenge.