What it sounds like. Foods that are considered to be "in", that hipsters and the general adolescent crowd of America live for. This includes frozen yogurt (preferably Pinkberry), tea, sushi, skinny lattes, Trident Layers gum, Jamba Juice, frappes, Sour Power Straws, Vitamin Water, any obscure health food dishes, etc.
John: Dude, I need some hipster food NOW. The plaid on my shirt is starting to fade away, my beanie is disintegrating, and I can't even name a single unknown punk rock band!
Bob: Somebody get this man a double venti vanilla frappaccino with extra soy milk, stat!