Person 1: Somebody farted.
Person 2: No, all I can smell is your breath.
Okay, listen up, buttercup. This joke is basically someone trying to blame a fart on someone else. But then the other person claps back, saying their breath stinks so bad, it's covering up any fart smell. It's a sick burn, because now person one is getting roasted on their bad breath! You probably have bad breath too. Go brush your teeth!