When someone is new to a game and gets really good RNG, so they think it's all skill not luck.
Especially big in singleplayer games since no one is there to trash talk.
Person 1: "Jim just got to gold rank yet he just started playing last week"
Person 2: "Have you seen the way he plays? All luck, no skill. Bet he's feeling "I'm So Good-itis" right now.
When you think you're so skilled, but in reality it's your teammates/characters that are doing all the heavy lifting. Resorting in you falling behind.
Josh: "wow I thought this game was supposed to be hard, I've cleared 11 stages already! I'm the best at this game". In reality Josh pulled a 5 star hero early on.
Josh was later on team wiped on stage 15, for disregarding lobby upgrades, and for not paying attention to his hero's needs/upgrades; Thus he has I'm so good syndrome.
A Shackteau is a humble, weather-beaten, structurally questionable shelter located in a spectacular or highly coveted place—Wales, Jackson Hole, Sun Valley, Crested Butte, coastal Maine, the Alps—where the building itself may be worth almost nothing, but the dirt, view, access, and mythology make it absurdly valuable.
In use:
Shackteâu - We thought it was an abandoned shed until the realtor called it a rare alpine Shackteâu with unobstructed views and listed it for $2million.