Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Eccentric, nervous, or crazy.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective resembling a squirrel
  • adjective unpredictable or jumpy
  • adjective eccentric

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

Examples

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