"Wonging" in Blackjack is a strategy where a player only participates in the game when the deck is favorable, based on a card counting system. The player tracks the remaining high and low cards to assess whether the odds are in their favor. If the count indicates an advantage, the player increases their bet and joins the game; if the count is unfavorable, they either sit out or leave the table. This method minimizes exposure to bad hands, but casinos may monitor for this behavior and ask players to leave if they are suspected of wonging. It's a more advanced technique that requires good card counting skills and an understanding of casino conditions.