gattsuri
Eating a large, satisfying amount of food. Also means 'thoroughly' or 'solidly' in general context.
💡Ordering a huge steak dinner — 'I want to eat gattsuri tonight.'
今日はがっつり食べたい気分だ。
I'm in the mood to eat gattsuri heartily today.
After the hike, I ate a ___ steak dinner.
ハイキングの後、○○とステーキを食べた。