A Dirty Chocolate Sundae is the act of a man shitting in the toilet, standing up after they've taken the shit, and jacking off— but only if they've ejaculated onto the shit in the toilet is it a Dirty Chocolate Sunday
Guy 1: I rubbed one out on the toilet and it turns out that the guy in the next stall heard everything.
Guy 2: I thought you said you had to take a dump.
Guy 1: I did. I made a Dirty Chocolate Sundae.