good-for-nothing; idler; freeloader
Derogatory term for a person who does no useful work and lives off others; literally 'waste-rice eater'.
That guy is just a freeloader.
Work properly so you won't be called a good-for-nothing.
Standard kanji spelling.
Variant using 喰 (eat) instead of 食.
Compound of 無駄 (waste) + 飯 (meal) + 食らい (eating, from 食らう 'to eat'). The image is of someone who eats meals without doing any productive work.