My wild guess: “Jay” stands for “Jordans”, that is, a pair of shoes which are deemed to be very cool by most kids.

So, “Jay AF” could mean “cool as fuck”.

Vinegar + SponsorBlock on iOS/iPadOS/MacOS.

You mean the Berlusconi phase, maybe.

Can’t say that’s it’s been working perfectly both on my iPhone and on my iPad, but it’s certainly helped a lot.

Vinegar app for Safari on iOS/iPadOS/MacOS has a very clever feature that’s called “switch to ad skipping”. It basically deceives YouTube by telling it you watched the ads and the videos load perfectly.

Also, UBlock Origin on Firefox’s been doing an excellent job at removing ads from YouTube.