Definition of happy-slappy in English:

happy-slappy

adjective

informal
  • 1Originally and chiefly US= "slap-happy".

  • 2Originally and chiefly British. Of, relating to, or involved in a happy slap or the practice of happy slapping.

Origin

1940s; earliest use found in The Tucson Daily Citizen. From happy + slappy. Partly after slap-happy.

Pronunciation

happy-slappy

/ˈhapɪˌslapi/