Da drawn-for-comedic-effect "squiggly-lips-
line"
facial expression dat a cartoonist employs to indicate a confused, shocked, or distressed mindset of da
character displaying said weird look.
Sarge: Look at all these awful news-items in the newspaper --- fire, floods, famine, you name it! I wish I could hear
even one little piece of actual GOOD news for a change!
Zero (in naive cheerfulness): My sore
toe is
better!
Sarge: (glances up at Zero with his classic "wavy-mouth" expression)