Much like the Guitarface, the Pokerface is used to hide emotion during poker or any other game involving cards.
Most people are incapable of this action as they tend to snicker or jump up and down screaming "FUCK YEA I'M SO GOING TO KICK YOUR ASS WITH THIS 'GET OUT OF JAIL FREE CARD' WHEN IT'S MY TURN AGAIN YOU FUCKING PUSSY!"
A pokerface for pooping during a Zoom call. For the sake of decent society, you have to carefully arrange your facial expression so that it's not obvious that you're downloadingmore than just video data.
Tony: The Thai food came back with a vengeance during the quarterly meeting. I don't think anyone noticed that I was on the toilet.
Fonzi: Ooohh is that why you were straining and staring into space? We thought you were mad! You've got a pretty good pookerface!