"When high school sophomore Jessie's long-term best friend transforms herself into a punk and goes after Jessie's would-be boyfriend, Jessie decides to visit "the wild nerd yonder" and seek true friends among classmates who play Dungeons & Dragons."
I'm getting this info from my local library's inter-library loan database. It's listed as juvenile fiction but no copies are in the network.
"Man, is there anything Jeff CAN'T do when it comes to gaming? This guy is like a critical 20 every roll. Jeff can bite the heads offa five game geeks, including their sorry-ass DM, and spit 'em into a large duffel bag ONE AT A TIME!...that's just the kind of messed up bastard he is! You think yer a gamer, punk? Well..do ya? Jeff will depants your weasel-ass right in front of your grandma."