Basically stands for 'mother fucking'
"Urgh, my m f-ing hammies are ripping in half" - http://www.youtube.com/watch?v=-sr4YqJAuZ4
by Khaira August 24, 2008

4 Words Related to M f-ing

speaking badly about someone behind their back
Ian & Denise were mf'ing Rich about how much of an a-hole he was.
by GV1 May 02, 2008
1. Fucking a bowling ball.
2. Masterbaiting against a friends wall.
3. Minking off
Dude, he is MFing the wall everyone come look!
by minkfan05 June 06, 2009

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