A substance that is thrown into doorways to ward off those one can not trust.
Bitch, I'm gonna throw some brick dust on this doorway so you can't get me, Pussy!
A homosexual act; The act of one man getting his penis sanded off by a belt-sander while the other male is sitting underneath the sander receiving all the bloody mess from above while masturbating.
-"dude how'd the trip go?"
-"pretty good, totally docked then got brick dust from Krazy Kyle."
The ejaculate substance from Abe Vigoda.
That guys so old, he's shootin' brick dust.