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sockeroo

[sok-uh-roo]
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noun, plural sock·er·oos. Slang.
  1. a notable success: Her performance was a sockeroo.

Origin of sockeroo

An Americanism dating back to 1940–45; sock2 + -eroo
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018