I know you directed this at NPC groups, but I'm at work and bored,
, so I decided to answer back for my NPHC org - Sigma Gamma Rho.
At formal meetings we call each other "Soror Lastname".......but when we're just hanging out it's "stinkypants, or Shelly, etc."
I like that there is a distinction between biz and pleasure.
However, it is not uncommon to hear the term Soror used outside of a meeting. It's really handy when you run into someone who you recognize, but you can't remember their name
. "Hi Soror" sounds better than "Hey .......you..." while trying to remember their name.
It is kind of tricky when people get married, and you're trying to keep track of their now preffered last name.