Adjective used to describe something that is at once benign and profoundly uncool. It is neither greatly bad, nor greatly good; it is fluff, kind of gross, and appeals to very few. While available everywhere, you know no one who likes something that can be described as Crystal Light. See "Call Your Girlfriend" video by Robyn-- this video is Crystal Light.
"Hey did you see that new Robyn video?"
"No, is it good?"
"No, man she is weird. And the video is so freaking Crystal Light."
"I would go to your party, but I think it is going to be Crystal Light as hell and I don't want to waste my Saturday."