Gaggery
Gaggery is when you're so into something it’s like it’s the only thing that matters. You'll yell at people for not liking it and probably blame them for your bad luck.
He got a new haircut and now he thinks it’s the best thing ever. I got fired because of it.
She got a new lipstick and now she thinks she’s a supermodel. I think she’s a gaggery.
This kid thinks his Minecraft character is the most popular kid in school. He’s a gaggery.