Originates from the show "Curb Your Enthusiasm", in which the star; Larry David, always inadvertently offends someone.
Man #2: Thank you, she thinks you're a terrific guy.
Man #1: She's hot too. Great tits.
Man #2: Excuse me?
Man #1: Ya' know, she's got a nice body. Nice. It's a compliment
Man #2: That's very offensive.
Man #1: It wasn't suppose to be.
Man #2: FUCK YOU!
Man #1: I just had a Larry David moment.