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1.
A fart with fallout. More than a wet fart. Usually unintended. Begins as gas, but finishes with value added.
His attempt to subtly, quietly relieve his gas pressure ended terribly in a loud atomic fart.
by MTSpacey February 16, 2007
 
2.
A very smelly fart and causes people to gasp for air and eventually have to open the windows.
I think someone died in here or someone let loose an atomic fart.
by Brandy May 15, 2004
 
3.
The atomic fart is incredibly loud and smells awful too. It also results in a big explosion causing everyone to fall to the ground, suffering the effects of methane poisoning.
Mischevous S just wipeout out that whole city with that atomic fart.
by Coopie June 17, 2005