FNG

Fondation Nationale de Gérontologie
Found on http://www.encyclo.co.uk/local/20895

FNG

F***ing New Guy
Found on http://www.encyclo.co.uk/local/21662

FNG

Fucking New Guy (US Military/British Army)
Found on http://en.wikipedia.org/wiki/List_of_U.S._government_and_military_acronyms
No exact match found