(phrase) describes someone who is so stupid and useless that it is a waste of food and money to raise him; describes someone who is undersized and doesn't appear to grow in size
Definitions (粵典–words.hk)
形容詞
形容一個人冇厘建樹，其存在只係阻埞嘥嘢食 to be useless (person)
Definitions (Wiktionary)
verb, Cantonese, of a person
to be utterly useless