Gambling term (most common in poker) but also used in video games describing an angry or "reeling" state of mind usually caused by a big or unluck loss. People playing on tilt play below their usual abillity and usually make larger and more aggressive bets to try to quickly recover their loss.
From video game culture. When your emotions stop you playing your A-game.
An analogy to the tilt mechanism in pinball: if you bump a pinball machine too hard, it will light a "tilted" message and refuse to work properly, throwing the game.
He lost half his HP in the first 30 seconds which was bad, but that got him tilted and he just YOLOed five enemies, a battle he couldn't possibly win.
That feeling you get when ur playing the online MOBA "League of legends" and within the first five minute s of a game all 4 of your team members simultaneously kill themselves then blame you for not helping. (can be applied to real life)
Online : (you to a teammate)-"BRO WTF WHY THE FUCK R U FUCKING WALKING INTO THE ENEMY"
(teammate) - "sorry i was on ifunny, its only a game bro chill"