cell blind

Obliviousness when walking or otherwise in motion while simultaneously playing with or peering at a hand-held gadget. Often a public nuisance, as when slow, erratic, or careless movement impedes or leads to collision with others; sometimes also dangerous to the cell blind themselves, as when crossing a busy street without looking because engrossed in texting, IM-ing, or similarly urgent activities.

See: cell blindness (n.), cell-blind (v., adv.), and cell-blindly (adv.)