You lost your favorite necklace and couldn't find it for a few days. Now your roommate gives you the necklace. You're surprised that she found it.
I looked everywhere for this! Where'd you find it?
This is a common exaggeration. It means "I tried hard to find (something)." Say this when you lost something and looked for it in a lot of places.
"Where'd" is short for "Where did..." For example:
Where'd he go?
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