have (one's) head up (one's) ass

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have (one's) head up (one's) ass

rude slang To be acting in a way that others deem stupid. Primarily heard in US. He has his head up his ass if he thinks we can get all of this work done in one night.
See also: ass, have, head, up
Farlex Dictionary of Idioms.

have (one's) head up (one's) ass

To behave in an ignorant or foolish manner.
See also: ass, have, head, up
American Heritage® Dictionary of the English Language, Fifth Edition.
See also:
  • asshat
  • sling