gatsu-gatsu
Eating in a rough, ravenous way — shoveling food without manners, driven by hunger or greed.
💡A very hungry person at dinner — 'He was gatsu-gatsu eating everything!'
お腹が空いて、がつがつ食べた。
I was so hungry, I ate gatsu-gatsu.
He was so hungry he ___ devoured the whole plate.
お腹が空きすぎて、○○食べてしまった。