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1.
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

Words related to M f-ing

m fing m-fing m-f-ing motherfuckin
 
2.
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
 
3.
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