For Android users, look up YouTube Vanced. It's basically the exact same thing as YT Premium but free. You're welcome.
A: Dude I want YouTube premium so I can play songs in the background but I'm broke AF.
B: Is your phone an Android?
A: Yep
B: Okay, then you can just download YouTube Vanced (google it), install the apk file and you basically have a modded YT app with all the features of Premium.
A: Oh wow! That's fricking awesome!
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).