A place where many unoriginal people gather, usually pretending to have a broader knowledge on certain subjects, they might carry exceptionally large books, wear glasses when their sight is flawless, etc. They take stereotypes to seriously and use them to improve their social image.
Let's go to Starbucks even if it's a posery their coffee's epic.
1. state of being a poser; state of posing
Hey. John got those new $300 Prada sneakers.
Bah. 'Such posery.