hole in the lip 

Notional leading cause of a beverage running out of the mouth and down your shirt due to poor aim (the mouth of your can was tilted to your nose) or poor control (tilted the coffee cup too far back).

Derived from the fact that it kind of looks like you took a hole punch to the skin just below your lower lip.

Dude, you spilled coffee all down the front of your shirt, you have a hole in your lip or something?

hole in the lip by Dennis The Tiger October 25, 2004