An act of sexual pleasure giving, in which a girl eats out an asshole while sucking on a fireball, and then proceeds to insert the fireball into the asshole with her toungue. An optional act of using a strap on to ram the fireball home may follow, but this is known as fireball fudgepacking.
Dude, I can't even sit down today after Trish gave me that atomic asshole last night. I thought it was going to be a regular rim job, but she upped her game. It was so nice.