"Tilted" WTF does that mean?

As Ruin said, that's not a new phrase at all.

To answer the question, it's a reference to old arcade pinball games, where tilting the machine (usually out of frustration) would cause it to stop working (as you would be cheating). Tilted in modern games is when you get angry or upset about whatever, and it affects your ability to play

this is not new lol and you can just search up the meaning on google

na it's always been around, kind of like dank memes.

Edit: it means you are emotionally affecting your gameplay in a negative way.