Plinge

Someone who is not up to date on current words and/or topics. Most commonly used in regards to online drama.

"Dude, my dad's plinge on all of this stuff. Trying to talk to him about it isn't going to help."

Plinch

Someone who is not up to date on current internet lingo. Usually describing someone not in the "in crowd".

"Dude, That guy's plinch."

"Yeah, He's been around for a while, but still hasn't caught up on all of the lingo."

"He's probably not that interested in the hobby."