"card game," 1834, Amer.Eng., perhaps from the first element of Ger. Pochspiel,
name of a card game similar to poker, from pochen
"to brag as a bluff," lit. "to knock, rap" (see poke
(v.)). Another version traces the word to Fr. poque,
also said to have been a card game resembling poker. The earlier version of the game in Eng. was called brag.
Slang poker face
"deadpan" is from 1885.