Dirty Kathy is when you feed a girl corn and laxatives for three days straight. You and your best bro then tie a plastic bag over her head with a hole only for the mouth. One begins by throat fucking her until she thows up, that puke is then used for lube to fuck her ass. You and your best bro then continuously switch from throat fucking to ass fucking her thus making an endless cycle of corn, shit, vomit and cum.