1.  slaphappy(s = adj.all) carefree, devil-may-care, freewheeling, happy-go-lucky, harum-scarum - cheerfully irresponsible; "carefree with his money"; "freewheeling urban youths"; "had a harum-scarum youth"

2.  slaphappy(s = adj.all) punch-drunk, silly - dazed from or as if from repeated blows; "knocked silly by the impact"; "slaphappy with exhaustion"