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1.
Having a great deal of not giving a fuck. MNGAF stands for Me No Give A Fuck.
Nick: Mike, do you want to do the AP Physics work today? Mike: Umm, MNGAF
by Nick Johnson February 28, 2005
 
2.
A state of mind where nothing matters...not caring about anything that you should be caring about. Like school or money. MNGAF stands for "Me No Give A Fuck" and is recognized by WAOUA.
Nick Says "Hey Mike, What is the intergral of 2x?"
"MNGAF" said Mike
by Mike Issari March 13, 2005