1. A window licker
for the 21st century: typically an intellectually stunted grown man so wrapped in technology that they could clean their cellphone's screen with their tongue in public and think nothing of it. Has a tendency to be hardcore fanatics for escapism tailored for people half their age; for example: comic book movies, pre-teen or teen fiction, children's cartoons and video games. See: Man child
2. A person whose phone has made them figuratively retarded, all self-awareness depleted from their mind. They treat their phone like a best friend in order to compensate for their social awkwardness.
John sat in the corner playing free to play games on his phone as the party commenced around him. John is a phone licker.