1 definition by Intrinsic_IZ_Clutch

Top Definition
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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