The frozen and contorted, usually mildly retarded looking, facial expression one makes for a few seconds before they let out a sneeze or when experiencing a "Sneezus Interruptus".
Check out his Sneeze Freeze. Take cover, it's going to be a BIG one!
Dude, you have an extreme squishy face you're sneeze freezing!
Bob: You were going to sneeze but it got away, huh?
Dave: How did you know?
Bob: I saw your sneeze freeze.