水米不打牙

shuǐmǐbùdǎyá ㄕㄨㄟˇ ㄇㄧˇ ㄅㄨˋ ㄉㄚˇ ㄧㄚˊ

    • not having eaten or drunk anything at all

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
water and rice don't touch the teeth
Meaning
A variant of 水米没沾牙: not having eaten or drunk anything at all.

Sources