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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.
butt egg by mto April 4, 2007
dumping your load in ones ass
butt egg by bigdrewdog October 4, 2006

egg butt 

A particularly awful smelling fart from deep within the bowels. It has the distinct sulfur odor usually associated with rotten eggs.
Stan: Dude, did you just shit your pants?

Eric: Mmmm, no. It was just egg butt.
egg butt by moraleboatanchor August 15, 2012

Eggyolk butt 

When you fart and it smells like eggs
"Oh my god what's that smell"

"Sorry I have eggyolk butt"
Eggyolk butt by Alllllllanoars April 24, 2019
a preson who is being really stupid, annoying or dumb
"your a stupid buttegg"
buttegg by Bricole April 29, 2006