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shithead

[shit-hed]
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noun Slang: Vulgar.
  1. a stupid, inept, unlikable, or contemptible person.

Origin of shithead

First recorded in 1910–15; shit + head
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for shithead

shithead

noun
  1. taboo, slang a fool; idiot: used as a term of abuse
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 shithead

n.

by 1961, from shit (n.) + head (n.).

Online Etymology Dictionary, © 2010 Douglas Harper