1 definition by Oshishi
When a person pulls down their pants, spreads their ass cheeks, exposing the inside of their ass, and farts. This will create a very funny sight/sound for the spectators. A good blow ass will involve shit coming out of the ass and hitting the floor.
Jerry knew that the only way to make his friends laugh would be to spread his ass cheeks, let his asshole expand, and blow ass.
by Oshishi June 16, 2009