A weapon developed by the Americans during WWII and under research by other countries including Germany. The weapon is classified as either a Gun type or implosion type.

Gun type weapons are unreliable and do not provide a large blast, therefor rendering it obsolete. Though it is easier to make. The process includes accelerating a neutron(s) into a ball of Fissionable material and inducing a nuclear Fission reaction.

Implosion type weapons are in current use, though, not much, they detonate explosives around a ball of Fissionable material and create immense pressure which induces nuclear Fission. They generally have a higher blast effect.

The Atom bomb was deployed twice at Nagasaki and Hiroshima to end WWII. Though, their use is still hotly debated today. Atom bombs have become very obsolete since the development of Hydogen bombs, Cobalt bombs, and then Thermonuclear warheads.
NUKLAR EXPLOZON!

The Japanese surrender! The atom bomb worked!
by CommandoDude February 8, 2008
when girl is giving head and you thrust ur cock down her throat and she throws up there for thrusting her head back and her head looks like the final cloud of smoke of a atom bomb.
by DReW rapoport May 28, 2008
1) Shooting heroin while stoned
2) Using any opiate in combination w/ marijuana.

Abreviation: a-bomb
A-bombs are the shit
by mike March 20, 2004
when you jizz all over a girl atom bombing her pussy
AWWWWW girl I think I atom bombed your pussy
by THE MOTHERFUCKER November 8, 2014
an atomic bomb is performed by climbing to the top of the stall and shitting (or attempting to shit) into the toilet from about 5 to 6 feet above the bowl

may also be called atomic dump
freddy climbed up on the stall and dropped an atomic bomb into the crapper
by pmoney February 23, 2005
A girl so hideous she surpasses a grenade or landmine in how nasty she looks. Usually refers to a really fat girl or a girl with a really ugly face.
Bro you see that atomic bomb Billy brought over? She almost blew my house apart!
by Sir Cheifs Alot October 18, 2010
The atomic bomb leveled cities; when did God give that right to men?
by Montes April 4, 2008