When you are performing cunnilingus on a not so fresh female. You become angered that she smells so you decide to give her a whiff of her own medicine. You then pretend that you are going to come up to kiss her and instead conjur up a burp and blow the smell directly into her nose.
One time I was going down on this chick and she stank real bad. I decided to get that bitch back and gave her a moby dick. She coughed and hacked real bad