WordNet (r) 3.0 (2006):
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, slaphappy] 2: dazed from or as if from repeated blows; "knocked silly by the impact"; "slaphappy with exhaustion" [syn: punch-drunk, silly, slaphappy]