1. cheerful, but careless about things that should be taken seriously
   • ● a slap-happy approach to life
2. (especially North American English)
   (also punch-drunk British and North American English)
   (of a boxer) confused as a result of being hit on the head many times
3. (especially North American English)
   (also punch-drunk British and North American English)
   unable to think clearly; in a confused state

[TahlilGaran] English Dictionary ▲