The term “rounder” is often associated with professional or semi-professional poker players who make a living or a significant portion of their income from playing poker. A rounder is typically someone who is well-versed in the nuances of poker, possesses a deep understanding of the game’s strategies, and has the ability to consistently make profitable decisions. What Is A Rounder In Poker: In the world of poker, the term “rounder” refers to a skilled and experienced player who frequently engages in high-stakes cash games or tournaments.