One who is restricted in the richness of their online experience due to being contstrained to (or insisting on ) using a mobile device with its accompanying lack of plugins and small screen size.
Also one who misses out on real life experience due to attention being focussed on their device all the time.
That site is all flashbased, I can't see a thing on this phone, what a mobitard!
hey did you see that just then, it was amazing!
nope, I was texting my mates.
You mobitard!
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"