A brick in poker is a term for a community card that doesn’t help improve the range of any player in the game. It’s most often used to describe disappointing cards on the turn or the river. It’s also known as a blank.
Brick Poker Example:
Let’s say that you have a K Q hand and your opponent has an 8 7 hand. The community board after the flop reads T 9 5. Then, the river brings up a 2 on the board. This is a brick, as it doesn’t help you or your opponent in any way.