Cellhole
A person using a cell phone while being completely oblivious to their surroundings, other people, or tasks requiring full and immediate attention.  
I watched a Cellhole weave dangerously in and out of traffic without using any turn indicators.

While navigating the store the Cellhole was compiling a verbal shopping list.

The ring tone in the theater indicated there was a Cellhole in the audience.

Just when the entrée arrived a Cellhole at the table next to ours decided to have an argument with his girlfriend.
