rictus

rictus \RIK-tus\, noun:
1. The gape of the mouth, as of birds.
2. A gaping grin or grimace.

Wipe that rictus off your face!
Whenever the Jeopardy theme plays, you can count on seeing his miserable rictus.
If God wanted you to close your mouth all the way, He wouldn't have given you a RICTUS... no?
I'd recognize that smug rictus anywhere!
Yes, his throat was slashed in a state of ecstasy. Some would say he died wearing a double-rictus.
There's nothing worse than the rictus of a homo erectus!