1) A player player who puts in his poker hours in a job-like way
2) Grind it Out, on the grind: working particularly hard, like when experiencing
an unlucky run of cards, to make an acceptable return on your time invested;
or when making a solid return when playing from a small bankroll at lower limits
"He Quit his job to become a grinder , he just won the world poker tour"
"what do you do for a living?"
"I'm on the grind"
"Today I'm grinding it out at the poker room."