use to describe a person that wears their collar flipped up. However the use of "flipped up collar kid" is supposed to be used as an insult because of the first letter of each word spell something.
When you call someone a "stupid flipped up collar kid" you actually are calling them a...
Either liquid niquil or any liquid drink with melatonin, Ashwaganda or other sleeping aids in a liquid form. If warm tea helps you get to sleep that could be sleepy juice too.
I could not sleep so I chugged some sleepy juice and now I'm so tired and sleepy.