abgedreht
crazy / eccentric
Colloquial for crazy, eccentric, or very unusual.
Er hat immer so abgedrehte Ideen für seine Kunstprojekte.
He always has such crazy ideas for his art projects.

crazy / turned off
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crazy / eccentric
Colloquial for crazy, eccentric, or very unusual.
Er hat immer so abgedrehte Ideen für seine Kunstprojekte.
He always has such crazy ideas for his art projects.

'Abgedreht' is the past participle of the separable verb 'abdrehen'. This helps you understand both meanings: you can 'abdrehen' (turn off) the water, or a person can colloquially 'abdrehen' (go crazy).
Hast du den Gashahn abgedreht, bevor wir gegangen sind?
Did you turn off the gas valve before we left?
The context makes the meaning clear. If 'abgedreht' refers to technical devices like a faucet or heating system, it means 'turned off'. If it refers to people, ideas, or art, it means 'eccentric' or 'crazy'.
Die Heizung im Keller ist für den Sommer abgedreht.
The heating in the basement is turned off for the summer.
In the meaning 'verrückt' (crazy) or 'exzentrisch' (eccentric), 'abgedreht' is a colloquial word. It is mainly used in informal conversations among friends or in casual contexts.
Seine neue Frisur ist echt abgedreht!
His new hairstyle is really crazy!
normal
'normal' and 'abgedreht' are opposites when describing how ordinary or unusual something is. 'normal' means that something is usual, calm, or expected. 'abgedreht' is colloquial and describes something very unusual, crazy, or eccentric. It can be meant positively, humorously, or critically, depending on the situation. 'normal' fits many neutral contexts. 'abgedreht' is more appropriate in casual conversations, for example about ideas, clothing, films, or behavior.

Der neue Film ist so abgedreht, dass wir die ganze Zeit lachen mussten.
The new film is so crazy that we had to laugh the whole time.
Für mich ist ein ruhiger Abend zu Hause ganz normal.
For me, a quiet evening at home is completely normal.