The result of drinking too many beers
Oh, man, I have to go home because I feel a major atomic gut bomb coming on.
The act of a very large gay man fucking another gay (or sometimes strait) Man so hard his molecular structure fails and leaves nothing but atomic traces
Paul: I'm gunna do some Atom Bombing this weekend you care to join?
Joe: Paul how many fucking times do I have to tell you I'm strait you fucking fag!!!!
Paul: Don't make me atom bomb you