Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Slang Eccentric.
  • adj. Slang Cunningly unforthcoming or reticent.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. resembling a squirrel
  • adj. unpredictable or jumpy
  • adj. eccentric

Etymologies

squirrel +‎ -ly, 1925. Presumably from erratic movement of squirrels, or by analogy with nuts ("insane"). (Wiktionary)

Examples

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