What does UFN mean?
Until Further Notice
Other definitions of UFN:
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How to use the term UFN:
There are no example uses of UFN at this time. We would greatly appreciate your contribution if you would like to submit your own!
More slang terms:

DITYID
Did I tell you I'm distressed

LOLPIMP
Laughing out loud peeing in my pants

RUNTS
Are You Nuts

AMF
Adios Mother Fucker