when your face gets so dried that it begins to crust and crumble; crusting of the face.
Ew... put some lotion on your face, you look like Erica Rosenbloom!
The face that one makes when feeling completely embarrassed, otherwise known as crusty. This face differs from salty face because when hears salty face, you look at whomever said those horrible words with a look of misunderstanding and beat the crap out of them. When one hears crusty face, they immediately start crying and rocking back and forth in the fetal position because you were humiliated so badly.
Megan: Hey you guys... Did you see that really pretty girl totally shoot down that loser?
All three: CRUSTY FACE!