UN-friend, or abbreviated as just 'UN'. A friendship that must
officially end (but never really does) due to complications in the
workplace or conflicts with other relationships (i.e. marriages,
boyfriends / girlfriends, etc). Singular and plural usage of UN is the
"Now that we are UN it is so much easier for me at home. Where are we
headed for happy hour tonight?" (Or) "I used to think she was sleeping
with our boss, but then I realized they were UN."