tablet potato

A person who uses an iPad, especially on a train, airplane, boat, or bus, and is oblivious to everything around him or her.

Ben: Excuse me, what time is it, please?
Girl with iPad, using zoom feature, staring at photo on screen of Lake Atitlan in Guatemala and not really paying attention: (Hrmmmphhh!)
Rachel: I don't think that girl's really paying attention. She's a tablet potato! Ask someone else...