vibradenial 

A defense mechanism in which a person or persons denies ownership of a cellphone that is loudly vibrating at an inappropriate time (ex: during class, at church, at a funeral, at an important business meeting, etc).

The class went into a state of vibradenial when the cellphone began to vibrate loudly and the teacher looked around for the culprit.

vibradenial by Erik Koepnick September 24, 2007