When a person palm strikes another person in the face out of anger or annoyance. This resembles turning one's face into that of a Pug (a type of dog) where physical features of the face have been flattened out as if one was hit by a frying pan.
This is different from a facepalm, where one would hit their own face with their own hand in frustration.
Guy 1: "Ughhh!!! My life SUCKS!!! I'm failing all of my classes this semester!!!"
Guy 2: "Shut up, you never even take notes or anything..."
Guy 1: "Yeah but at least I'm there every day to listen."
Guy 2: "Stop bitching, you play fricking computer games all class. Just stfu!"
Guy 1 gets *PUG FACED* by Guy 2
1. A facial expression pertaining to grumpiness or seriousness.
2. A person who is grumpy or in a foul mood.
You are such a pug face!