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mindblower

[mahynd-bloh-er]
noun Slang.
  1. a hallucinogenic drug.
  2. something that astounds, excites, or dismays: The news of the loss of the cargo ships was a real mindblower.
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Origin of mindblower

First recorded in 1965–70; mind + blow2 + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018