へのへのもへ

Etymology
From the hiragana characters used to draw it.

Noun

 * 1) a face drawn using the hiragana characters he (へ), no (の), he (へ), no (の), mo (も), and he (へ)

Usage notes
The first two he are the eyebrows, the two no are the eyes, the mo is a nose, and the last he is the mouth.