'slaphappy' definitions:

Definition of 'slaphappy'

(from WordNet)
adjective
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]
adjective
Dazed from or as if from repeated blows; "knocked silly by the impact"; "slaphappy with exhaustion" [syn: punch-drunk, silly, slaphappy]

Synonyms of 'slaphappy'

From: Moby Thesaurus