That Guy is an individual who ruins the vibe group settings, typically concerning fandom or team-based games. He will typically begin his antics with no self-awareness, though what sets him apart from people who have typical social-awkwardness is his doubling-down upon being called out for his shit behavior.
That Guy may partake in any of the following: make inappropriate comments/jokes at inopportune times/places, get into arguments with others constantly over a wide range of issues, flirt with others while ignoring all rejections, and/or partake in a variety of elitist actions which push into the realm of elitism.
Kenny really had to be "that guy" and ruin DnD last night by bullying Dan for being new to the group.
Ethan Howard Gray from St. Cloud, MN.
You ever heard ‘that guy’? Yeah that’s Ethan Gray.
the guy litrally no one wants to be, and if your him, everyone knows it.
guy#1: I need to call her again, I can't live without her
guy#2: don't be "that guy"
Chris/Strawhat rei/RaskullsDemon
Chris, also know as strawhat rei and raskullsdemon is that guy