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Adjective: slaphappy  'slap,ha-pee
Usage: informal
  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, fuddled, irresponsible

Encyclopedia: Slaphappy