“Hipster” is more than a noun — it’s a lifestyle. An overused, albeit elastic, coinage, it can describe everything from vintage T-shirt connoisseurs to those who kinda sorta maybe know Cory Kennedy. And now it’s a subject of highbrow discourse. And while some of it is dry academic gobbledygook — word, have you heard, hipsterism is a play of surfaces? — there are enough interesting tidbits to make it worthwhile reading material, whether or not you ride the M train.