fnun 

A fucking nun. An effing nun. Fnun.

Pronounced... (letter sound of F)-nun

Dude, check out that fnun.

fnun by JFC.Chung April 23, 2008

fnunk

a combination of the 2 words fucking noob.

Guy 1:Yes,I got the first 10 levels done of this game!

Guy 2:wow you are such a fnunk.

fnunk by jicherty August 6, 2009