slaphappy

[slap-hap-ee] /ˈslæpˌhæp i/
adjective, slaphappier, slaphappiest. Informal.
1.
severely befuddled; punch-drunk:
a slaphappy boxer.
2.
agreeably giddy or foolish:
After a martini he was slaphappy.
3.
cheerfully irresponsible:
a slaphappy crowd.
Origin
1935-40; slap1 + happy
British Dictionary definitions for slap-happy

slap-happy

adjective (informal) -happier, -happiest
1.
cheerfully irresponsible or careless
2.
dazed or giddy from or as if from repeated blows; punch-drunk
Slang definitions & phrases for slap-happy

slap-happy

adjective
  1. Disoriented and stuporous, esp from being hit too often about the head: a slap-happy bum (1936+)
  2. Vertiginous; off balance: designed to knock philologists slap-happy
  3. Euphoric; intoxicated; high: He was slap-happy a whole week after the baby came