any member of the T-Mobile sidekick family. especially, however not exclusively, when used by a kid who belongs to the "scene." the "scene" is most readily identified by boys or girls wearing tight pants, sporting haircuts which cover exactly three fifths of their face (from top corner to bottom opposite corner, and ALWAYS covering at least one eye), and rawking those sick american apparel deep v-necks.
"yo percy, did you see alyssa texting on her sidekick ALL during that class? i wonder what her phone bill is on that scene machine."