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See more synonyms for slaphappy on Thesaurus.com
adjective, slap·hap·pi·er, slap·hap·pi·est. Informal.
  1. severely befuddled; punch-drunk: a slaphappy boxer.
  2. agreeably giddy or foolish: After a martini he was slaphappy.
  3. cheerfully irresponsible: a slaphappy crowd.
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Origin of slaphappy

First recorded in 1935–40; slap1 + happy
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018