juxtaposer

someone who is legit when one-on-one, but isn't true to their ideals when around other people to try to impress them

Guy 1: Yeah, we hung out one day, and I got to know him really well. He seemed pretty cool, but...

Guy 2: But what?

Guy 1: We went to a party and he was trying to act like a badass to all the douchebags. It was embarrassing...

Guy 2: Sounds like a real juxtaposer.

by o0klutz September 14, 2011

juxtaposeur

A fake or phony person who tries to act like he's part of a group by just showing up and hanging around the people in the group all the time.

Jim acts like he's part of the team but no one even knows where he came from; he's just a juxtaposeur.

by skittlekicker June 1, 2016