To have your attention "stolen" away from an intense activity (like playing a game) by the incessant ringing or ring tone of your phone, which of course, you have to answer.
Origin from 'hijacked': as the past-progressive meaning stolen in a violent fashion.
I was just about to frag this dude when I got phonejacked and some high-ping lamerfragged me from behind.
A person who constantly, or frequently calls a person without said person's consent, much to the person's dismay. This could be due to the fact that gas prices are going up, that the person is scared to follow you, that the person MUST use all their minutes so they don't expire, or that your voice on the phone just turns 'em on.
"Phonestalker."
"I'M NOT A PHONESTALKER! I ran out of minutesanyway..."
"I'm saved!"