In poker, a game that alternates between Texas Hold'em and Omaha. Omaha is represented by "A" because in other poker acronyms (such as "HORSE"), "O" is used to mean Omaha Hi-Lo Split; in "HA" the Omaha game is High-only.
He spent all day in the online poker rooms, winning $1K in 7-card stud, but losing twice that much playing 5-card draw, HORSE, and HA.
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