Poser

1.Someone who pretends to like a certain thing to amuse a certain crowd.
2.Someone who pretends to like something they know little about just because there friends or people they know like it.

Person one: "Dude did you hear about Daft Punks new album?
Person two: "What new album?"
Person one: "There new album it was so overhyped! It's called Random Access
Memories!"
Person two: "Oh yeah! That one!"
Person one: Yeah! Don't you love Get Lucky?
Person two: "Yeah I know I listed to it like 100 times! Which album is it
From again?"
Person one: "Dude.... Your such a poser."