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1.
FNM
FNM stands for Faith No More. Faith No More is an American rock band from San Francisco, California, hailed as one of the most influential metal/rock bands of the late 80s and early 90s, and credited for inventing alternative metal and as an influence on nu metal.
Bro 1: Link me to some good music, bro.

Bro 2: Here's "Epic" by FNM.

Bro 1: FNM?! They're fucking epic!
by feasty August 21, 2012
 
2.
FNM
Fucking Northern Monkey
If that FNM Mark gets on my nerves one more time, I'm going to get his arse all the way back to Manchester
by Cornish Boy November 08, 2007