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goofball

[goof-bawl]
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noun Slang.
  1. an extremely incompetent, eccentric, or silly person.
  2. a pill containing a barbiturate or a tranquilizing drug.
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Origin of goofball

First recorded in 1935–40; goof + ball1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for goofball

goofball

noun US and Canadian slang
  1. a barbiturate sleeping pill
  2. a fool
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for goofball

n.

"narcotic," 1938, from goof + ball (n.1); as an intensive of goof (n.), it dates from 1959.

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Online Etymology Dictionary, © 2010 Douglas Harper

goofball in Medicine

goofball

n.
  1. A barbiturate or tranquilizer in the form of a pill, especially when taken for nonmedical purposes.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.