Other contributors have said "What is groat disease?" is the same question as "What is Groat's syndrome?".
What is Groat's syndrome?
Answer:
Groat's syndrome is a fictional neurological disorder (as discussed in "Curb Your Enthusiasm," Season 2, Episode 5).
This hypothetical diseases is marked by hyperactivity "Like after 5 cups of coffee," and it was named after the fictitious doctor in the show who first diagnosed it.
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