What does it mean to say that a person pecks rice?

Pronunciation [xi m: oj and zhuó m ǐ]

Definition means that you don't know how to pretend to understand.

The source comes from Stephen Chow's version of "Tang Bohu Dianchouxiang". At first, Tang Bohu's famous painting was called "A Hundred Birds at the Phoenix". Then, a fool pretended to be Tang Bohu, and was asked to draw "birds fly at the phoenix"-he drew a picture of "a chicken pecking at rice".