Anything that is percieved as "upscale" from a blue-collar point of view. 'Bougie' (pronounced boo'-she) is a hacked truncation of the word Bourgeoisie, which refers to the middle-class in Europe, but refers to a more affluent class level in the United States.
In the United States, which lacks strict social classes, Bourgeoisie is sometimes used to refer to those seen as being upper class.
Did ya see Luthur just roll up in his bougie new BMW?
You can eat your bougie $25.99 salad from Central Market for lunch, but I'm hangin' with Mikky D's!
(as is confirmed by the dictionary definition from Merriam-Webster)
"I wandered into the sex shop, and there, this woman set me aside to explain to me how to use a bougie. And then I turned around and noticed my mom, who had been staring at me the whole time."
Boy: Dang, he's so bougie.
Boy: Wow, she's wearing Pink when it's not a Wednesday?
Girl: OMG thats too bougie. This is unexcusable.