frolic

Short definition from Wiktionary

Adjective

1. 1
   Merry, joyous, full of mirth; later especially, frolicsome, sportive, full of playful mischief.
2. 2
   Free; liberal; bountiful; generous.

Verb

1. 1
   To make merry; to have fun; to romp; to behave playfully and uninhibitedly.
2. 2
   To cause to be merry.

Noun

1. 1
   Gaiety; merriment.
2. 2
   A playful antic.
3. 3
   A social gathering.