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Mean Time Between Failure
Way to quantify the performance of a machine or part.
MTBF = (Total Time of all Parts run) / (Total number of failures)
Good if all parts fail.
Bad if very few of the parts fail. It is very deceptive in this case.
A hypothetical machine generally runs between 60 and 100 hours before failing.

If you run 3 of them for a total of 240 hours, and all 3 fail, you have a MTBF of 80 hours per failure. Makes sense.

If you run 100 of them in an application where the job is complete after 50 hours, at which point you don't run it again, it is possible that only 10 or so will fail. MTBF could be about (90*50 + 10*25) / (10) = 475 hours per failure. This is insane, since you would be lucky if a single tool made it to 200 hours or continuous operation.
MTBF by guided fox July 7, 2006
Related Words
mtbfu MTFU mtbf mobfur Mbfunk15 mtbfl
for somthing to be really cool, great or hairy. (Perth Australian Slang)
That chick is F*cken mobfur..
mobfur by Urbanlegend October 15, 2003
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."
MTFU by Dansas October 30, 2006
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!
MTFU by Johnny 2 Sheds! May 29, 2009

Mbfunk15 

A smart and strategic person with a quick wit
Oh he's totally a mbfunk15
Mbfunk15 by Mbfunk15 February 27, 2021
David: You heard what Stacy did to Brian

James:Yea that's mtfu
Mtfu by Inigma January 17, 2017