A term used when "that's gay" isn't enough. It's like saying "That's the fucking stupidest thing ever." because that's exactly what scene kids are.
Marcos: My mom won't let me go to the movies.
Emily: Damn, that's fuckingscene kid!
Marcos: Yeah, she's fucking scene kid.
Emily: I fucking hate scene kids.
Used when someone is trying to give you unsolicited instruction or advice, and just plain annoying you while you work.
Diego was trying to tell me how to get the sticker off the side of the truck, which I had done a million times before. After listening to him for 5 minutes I replied "who's fucking this chicken?"