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holy moly

[moh-lee]
interjection Slang.
  1. (used as an exclamation to express surprise or astonishment.)
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Origin of holy moly

moly coined as rhyming twin to holy, on the model of holy cow, holy smoke, etc.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018