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GSDMF stands for Get Shit Done Mother Fucker. It is a derivative of GSD, which stands for Get Shit Done. It usually refers to some sort of work or task, and is used when a GSD just isn't enough to get the point across.
Employee: I have so many things to do today before I leave.

Boss: GSDMF!
by RayRay1313 March 10, 2011
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