Sitting in a bathroom stall on the toilet regardless of whether you have to poop or not just to take a non-scheduled break from work.
Usually this is done right before or right after a scheduled break.
The individual spends between 20-45 minutes in the bathroom and a lot of the time is talking on the phone or sleeping.
Oh look, Jorge is going to the bathroom again. Must be taking a Mexican Break.
Jose was in the bathroom stall for 45 minutes taking a Mexican Break.