tron

   [NRL,  CMU;  prob.  fr. the movie Tron] To become inaccessible except
   via  email  or talk(1), especially when one is normally available via
   telephone  or  in  person.  Frequently used in the past tense, as in:
   "Ran  seems  to  have tronned on us this week" or "Gee, Ran, glad you
   were  able  to  un-tron  yourself".  One may also speak of tron mode;
   compare {spod}.

   Note  that many dialects of BASIC have a TRON/TROFF command pair that
   enables/disables   line   number   tracing;   this   has  no  obvious
   relationship to the slang usage.

[glossary]