A sexual toy that is inserted into the anus...preferably "vibrating". Often available with a "safety tether".
As I walked away from the mirror I found that my butt egg had become disengaged due to its safety tether.
by mto March 28, 2007
by Marshall Law November 12, 2004
A particularly awful smelling fart from deep within the bowels. It has the distinct sulfur odor usually associated with rotten eggs.
by moraleboatanchor August 15, 2012