Sisters in my chapter receive their "official" nicknames the semester after their initiation...they are presented to them on their jersey by their big sister. (It's a local ritual which we like to call: Jersey Ritual.)We also keep the meanings behind our nicknames secret and reveal them after initiation.
My "official" nickname is S.M.O.O.C.H.E.S. ,
BUT my pledge class also gave each other nicknames....
I was dubbed T.R.A.U.M.A. Queen
(As you can see, we are infamous for our acronyms)