While balls deep in a vagina from behind whilst wearing a skeleton costume and a pink sock starts sneaking its way out, quietly peel off an arm bone and jam it in her anus while you continue merrily on your way to ejaculation.
To be totally and completely ripped off. To be so royally cheated you feel sick. Like seeing a girl's photo on a dating site, hitting it off with her on the phone, then you meet her in person at a bar and see her coming out of the men's room with the nicest adam's apple you've ever seen.
Doctor: "I'm sorry sir, there was a problem with your kidney transplant."
Richard: "What happened?"
Doctor: "We thought a gumball machine would work as good as an actual kidney... we were wrong. You only have about twenty minutes to live."
Richard: "C'mon man, that's dirty skillog nuts!"
Doctor: "Yes... yes it is."