tron [NRL, CMU; prob. fr. the movie "Tron"] v. 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.