Polish Defense is where you intentionally give a penalty call to the opposing team in order to rob the clock of the final seconds and limit them to 1 or 2 plays, effectively neutralizing their chance at a final, game-winning, scoring drive. Keep in mind that Matt Ryan against Seattle scored a game-winning FG on a 3 pass drive in UNDER 18 SECONDS! In fact, with the remaining 8 the Seahawks damn near almost scored a TD!!!!
Football can be won in the final 30 seconds, so the Polish Defense is a an old-school way to rob a team of that chance when you already have the lead