Define Coffee Poo Meaning

9am

Dude 1: Ahh one minute bro just need to go take my coffee poo.
Dude 2: No worries man see you in a bit

11am

Dude 1: Sorry bro just need to go take a coffee poo
Dude 2: Didnt you have one earlier?!?

Dude 1: Yeah but I just drank another coffee.