When the person consistently smokes weed or takes drugs. (Crackhead).
David: Yo man, Vlad hasn't stopped smoking for like 2 weeks...
Thomas: I know, the guy is a total Scratch head!
When a person had a symptom of Tourette’s syndrome where they constantly scratch their head.
“Christ! I got distracted from my head scratch and blew us the game!”
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Action of someone scratching there head in confusion.
She did the Nora Head Scratch