Warrington omelette
Sexual act - masturbating into a female (or male, whichever floats your boat) and you ejaculate into her/his mouth and then the offender proceeds to spit the contents of your testicles onto her chest while performing a rubbing motion that can be seen practiced in karate kid.
Guy: I gave a chick a Warrington omelette last night. Guy 2: pure filth.