When a guy takes a crap in another guys mouth and then the guy with the crap in his mouth sucks the other guys dick... so then the guy that crapped had his own crap all over his dick and then he gives the other guy anal, transferring his crap in to the other guys anus.
"Hey, your crap is in my rectum because of that brownie sundae"
"A brownie sundae is the dirtiest thing you could possibly do."
An action resembling the notorious Hot Lunch, however with no cum and shit only. Accidentally happens when the clingfilm bursts open before the partner ejaculates, or for partners looking for the ultimate shit.