the.com/poker face

The art of looking bored while holding either nothing or everything.

means A facial expression that reveals absolutely nothing about what you're thinking or holding, especially in a tense or competitive moment.

from Straight from the card table. In poker, a player's face can give away the strength of their hand — a flicker of excitement, a twitch of worry — so skilled players train their features into a blank, unreadable mask. The term surfaced in American English in the 1800s alongside the game itself, then wandered off the felt to describe anyone concealing their true feelings behind a deliberately neutral expression, from courtrooms to job interviews to awkward family dinners.

origin
From poker, where betting big needs zero facial feedback
science
Pros actually watch hands and breathing, not faces
tell
Everyone has one leak, usually under pressure
irony
Trying too hard to look calm is itself a tell
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