Bricks refer to adding Bricks to the Southern border wall. As a welcoming gift, every new Trump supporter got a (virtual) brick to add to the wall.

The bricks were given by an auto-comment brickbot, so whenever the word "brick" was typed into a comment the bot would show the number of bricks dispensed over time, and how many billions more were need to complete the wall.

Sadly, I believe, the autobot has been retired.