Upon completing a rimjob, and finding your partner has ill-prepared their anus for such coitus, vengefully kissing them to show your displeasure in the fecal matter that has accumulated on your lips.
"He kept asking for a rimjob and assured me that he kept his ass clean as a whistle. Sure enough, he was a liar like all the rest, and I had to give him a Hershey's Kiss to show him how it felt!"
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