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1.
Acronym - Man the fuck up.

Man the fuck up.
Man the fuck up.
Man the fuck up.
Man the fuck up.
When losing at beer pong or caps, tell your teammate he needs to man the fuck up. "MTFU, Juice."
by Dansas October 29, 2006
 
2.
Man The Fuck Up!

An exclamation of disgust aimed at an individual who is incredibly weak willed and looks like they are going to either blub or piss their pants!
Oi fairy, have another pint and MTFU!
by Johnny 2 Sheds! May 29, 2009
 
3.
Man the fuck up
"i cant fire him,"
"dude, M.T.F.U.
by Radarhut February 17, 2011