laid a brick
To let a big poop drop out of your butt, usually when you least expect it and it makes a mess.
I was walking down the hallway and laid a brick on the floor. My teacher looked at me like I was a monster.
During the meeting, I laid a brick right in my boss's shoe. He screamed and ran out.
I tried to hold it in during the test, but I laid a brick on my desk. The whole class laughed.