A complicated idiom used by small, loser-ish people to describe something with great enthusiasm, can be used both positively or negatively. Used in place of words such as motherfucking, or m'f (em effing)
Me: STOP! You're getting on my nerves!
Loser Girl: Ugh! you're so muh'fuh'effing annoying!
Me: Who the fuck says that?!
Loser Girl: Whatever! *farts* and runs away
Loser Girl: Ugh! you're so muh'fuh'effing annoying!
Me: Who the fuck says that?!
Loser Girl: Whatever! *farts* and runs away
by IKnoAStarWhenIHearOne January 17, 2013
Get the muh'fuh'effingmug.