When someone really doesn’t believe you… it’s a more exaggerated usage of the word “Bet”
Blair: I’m gonna go shopping in the morning after my 12 hour shift.
Sam: That’s a bet and a half!
When someone really doesn’t believe you…. It’s a more exaggerated usage of the word “Bet”.
Blair: “I’m gonna go shopping in the morning.”
Sam: “That’s a bet and a half.”