Definition of party-hearty in US English:

party-hearty

(also party-hardy)

adjective

US
informal
  • Fun-loving; eager to drink, socialize, dance, etc., especially unrestrainedly or frequently; encouraging such behaviour.

Origin

1950s; earliest use found in The Washington Post. From to party hearty (also hardy).

Pronunciation

party-hearty

/ˌpɑːtɪˈhɑːti/