"slaphappy" in the adjective sense
1. carefree, devil-may-care, freewheeling, happy-go-lucky, harum-scarum, slaphappy
cheerfully irresponsible
"carefree with his money"
"freewheeling urban youths"
"had a harum-scarum youth"
2. punch-drunk, silly, slaphappy
dazed from or as if from repeated blows
"knocked silly by the impact"
"slaphappy with exhaustion"
"punch-drunk with love"
Source: WordNet® (An amazing lexical database of English)
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