Someone with a pointy face. His chin and his forehead are far back compared to his nose. Those people are always very ugly and no one likes them. At school, they are rejects.
the shocked look on one's face as they realize they have not farted as they expected, but indeed sharted instead. shart face most commonly occurs during public sharts.
Dude I was talking to Sarah and I was really nervous and had to fart. But then I sharted and I had the worst shart face. Fuck.