お腹なかいっぱい

noun, noun which may take the genitive case particle 'no', adverb

full stomach; bellyful; eating heartily

Describes the state of being physically full after eating, or the act of eating until full. Often used adverbially with 食べる.

• お腹なかいっぱいで、もう何なにも食たべられない。

  I'm so full I can't eat another bite.

• 今日きょうはお腹なかいっぱい食たべた。

  I ate my fill today.

adverb

to one's heart's content

Used adverbially to mean doing something as much as one wants, not limited to eating. Often with verbs like 遊ぶ, 泣く, 話す.

• 休やすみの日ひはお腹なかいっぱい遊あそんだ。

  On my day off, I played to my heart's content.