Wikipedia
Hack-a-Shaq is a basketball strategy initially instituted in the National Basketball Association (NBA) by the Dallas Mavericks coach Don Nelson to hinder the scoring ability of the opposing team by continuously committing personal fouls against one of its opposing players, the player chosen being the one with the weakest free throw percentage among players on the court. The strategy has been curtailed somewhat starting in the 2016-17 NBA season, as intentional away-from-the-play fouls committed within the final 2:00 of any period and overtime will result in one shot for the fouled team and possession of the ball.
Nelson initially devised the strategy for use against the Chicago Bulls, specifically power forward Dennis Rodman, who was a poor free throw shooter. However, it ultimately became better-known for its implementation against center Shaquille O'Neal, also known for his low free throw percentage. The name of the strategy is sometimes altered to reflect the player being fouled, for example Hack-a-Howard for Dwight Howard.