noun
good-for-nothing; idler; waster
A derogatory term for someone who is unproductive and lives off others, literally 'one who eats idle meals'. Often used in the phrase 無駄飯食いの役立たず.
あいつは本当に無駄飯食いだ。
That guy is a real good-for-nothing.
無駄飯食いの役立たずと言われた。
I was called a useless idler.
Compound of 無駄 (muda, 'waste') + 飯 (meshi, 'meal') + 食い (kui, 'eating'), literally 'one who eats wasted meals'.