不知吃几碗干饭

Traditional (Taiwan): 不知吃幾碗乾飯

bùzhīchījǐwǎngānfàn ㄅㄨˋ ㄓ ㄔ ㄐㄧˇ ㄨㄢˇ ㄍㄢ ㄈㄢˋ

    • to lack self-awareness
    • to not know how little one is capable of

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
not knowing how many bowls of dry rice one eats
Meaning
Not knowing how little one is capable of; lacking self-awareness. Mocking.

Sources