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.
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.