The amicable splitting of a couple - not yet scientifically proven to be possible.
Mr Smith's publicist claimed that the split with his lover was cold fission.
by B Ligerati January 11, 2008
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Basically everything on the periodic table except extremely radioactive. Stereotypically known as the scary stuff that Fukushima and Chernobyl released from their damaged nuclear reactors poisoning the surrounding countryside forever.
The Fission Product releases from the spent fuel pool fire expelled many times the radioactive materials that one reactor could have released.

The fuel elements were ejected from the core during subsequent explosions and the fission products will be a hazard for many centuries to come.

The Fuel lava consists of various fission Products.
by Sir Geiger February 18, 2012
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When you stick your penis into your butt hole.
Person 1: Dude why are you limping?
Person 2: I just had Binary Fission last night
by willyson January 29, 2009
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A word that is said in occurance when absolute and complete pwnage has been indignantly brought upon by a poor soul.
Allan FISSION MAILED! it when Travis threw a tennis ball at Allan's left nut.
by PLLL0WTALK January 6, 2006
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Derives from the game "Metal Gear Solid 2"

it means "Mission Failed". which is used as a derogative term to slander someone/ someones argument that they've put forward in a debate, it is both patronizing and shows that you're putting an end to the argument.

Considered to be part of l33t sp33k. Gaming slang. Often used as the end of a sarcastic comment.
Oh yeah!! i forgot Lilly Allen does write good lyrics!! ......Fission Mailed.
by Intrinsic_IZ_Clutch July 20, 2009
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a thermo-nuclear explosion due to a cooling system malfunction of a nuclear power plant or other nuclear powered system.
hiroshima enjoyed an unrequested fission surplus
by badasstattooz December 13, 2012
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