Blurring bricks occurs when two people decide to perform anal sex, due to the other hole being closed for construction, and the receiver doesn't properly clean their anal cavity. The giver then smears the poop along their butt cheeks, hence "blurring their bricks."
The act of wet farting with an especially low toned, bubble popping quality. Reminisent of geothermal mud pools, or molten lava, that expel gas through large surface bubbles.
Likely to leave uncomfortable 'reah splotch in undergarmets. Can be disastrous if one is freeballin'.