25B6; adverb (informal)
his slap-happy friend : HAPPY-GO-LUCKY, devil-may-care, carefree, easy-going, nonchalant, insouciant, blithe, airy, casual.
slap-happy work. : See slapdash .
she's a bit slap-happy after such a narrow escape : DAZED, stupefied, punch-drunk.