What is Search Me?
1.
A phrase meaning "I don't know," or "How should I know?" It can sometimes be used in an indignant manner.
Person #1: Where's my left shoe?
Person #2: Search me.
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"So why are you still here?" Harry asked Ron.
"Search me," said Ron.
"Go home then," said Harry.
- Harry Potter and the Deathly Hallows by JKR, pg. 308 (US edition)
See