Tinted glasses used to hide a players eyes during a card (poker, etc.) game.
Play of words on the sunglasses brand "BluBlocker", which used to regularly have cheesy infomercials.
Be on the look out for milkels when a player is sporting Bluff Blockers.
I can never figure out what hes doing with those damn bluff blockers on.
I plan on cleaning up tonight, I brought my bluff blockers.