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Adjective: slaphappy  'slap`ha-pee
  1. Cheerfully irresponsible
    "slaphappy with his money"
    - carefree, devil-may-care, freewheeling, happy-go-lucky, harum-scarum
     
  2. Dazed from or as if from repeated blows
    "slaphappy with exhaustion"
    - punch-drunk, silly

See also: confused, irresponsible