When you go to that party and hook up with that crazy bitch who, after giving you a pleasant yet rough hand job, shits on your hand wherein you proceed to fist her loose vagina with your shitty hand while screaming your ex girlfriend/wife's name.
Guy 1: "Yo I heard things got real weird last night at that party."
Guy 2: "Yeah...... I gave that Dunkin Donuts bitch Stacy the old 'Dirty Marcello'."
Guy 1: ".....She shit on your hand and you fisted her screaming your ex girlfriends name? You realize she was 14 right bro?"
Act of defecating in one’s mouth, then throwing it up in another mouth, being fed like a baby bird. the two men have to be gay midgets in order for it to be a dirty marcelis
i got freaky with this onedude and let me tell you he didn’t expect that dirty marcelis. works everytime!