Leroy

Verb. To "Leroy" is the act of two people, generally homosexual, pressing their assholes against each others and then one of them proceeding to defecate into the other's asshole.

John squatted over James and they scissored, pushing their cheeks apart until their assholes kissed. John pushed hard and felt his poop exit his asshole as it slid directly into James'. They had just performed a Leroy.