What does FNU mean?First Name Unknown
Other definitions of FNU:
All of our slang term and phrase definitions are made possible by our wonderful visitors. If you know of another definition of FNU that should be included here, please let us know.
How to use the term FNU:
There are no example uses of FNU at this time. We would greatly appreciate your contribution if you would like to submit your own!
More slang terms:
Area code for Detroit
Miss You Very Much
i want to f**k you