Onomatopoeic representation for the sound a primate makes when he flings bodily discharges (feces, urine, or semen) at unsuspecting onlookers. Typically used in reference to something disgusting that may or may not be flung through the air.

When you eat dirt for the first time and leave your family to build a shack in the woods

polite way of saying "fucking A"

An abbreviation of what I say at/about my beat down office job several times daily.

A way of saying that something is F*ing Awesome

Fucking Non Athlete

Comes from mormons, used to describe Friday Night Activity. They use this time so they dont have to deal with the real world of non-belivers. When they hear the other meanings of FNA they will give you a confused look.