ˈ ̷ ̷ˌ ̷ ̷ ̷ ̷ adjective
Etymology: slap (II) + happy
slang : punch-drunk , witless
slaphappy with exhaustion — Ned Calmer
it's driving me slaphappy . In fact, I'm getting whacky — William Kozlenko
also : buoyantly carefree : deliriously irrational : crazy
slaphappy abandon with which members … have been prying state secrets out of the administration — New Yorker