Source : WordNet®

slaphappy
     adj 1: cheerfully irresponsible; "carefree with his money";
            "freewheeling urban youths"; "had a harum-scarum
            youth" [syn: {carefree}, {devil-may-care}, {freewheeling},
             {happy-go-lucky}, {harum-scarum}]
     2: dazed from or as if from repeated blows; "knocked silly by
        the impact"; "slaphappy with exhaustion" [syn: {punch-drunk},
         {silly}]
     [also: {slaphappiest}, {slaphappier}]

slaphappiest
     See {slaphappy}