jackface
A face so bad it should be in the dictionary next to 'disgusting'.
"His face is a jackface.", said by a kid who had to sit next to him in lunch.
"She made a jackface when she got called out in front of the whole class.", said by a kid who was just watching.
"That's a jackface, and it's not even lunchtime yet.", said by a kid who had already had a bad day.