When you go to the toilet for a poo but also have wank as well, therefore completing
the triple threat (poo, piss, wank).
The combination of which it's done is very important. It's normally
recommended to have the wank first, however this would mean holding your poo in and risk it being sucked back up.
The other option of course is having a wank after you've had a poo and a piss, so your willy is dribbly and your hand is covered in piss, whilst trying to get hard with a
massive shit in the toilet below you stinking out the room.