Haiktastic
When your face turns into a giant O because you're so stunned it looks like you just got hit by a surprise and you can't shut your mouth.
I saw my crush wearing my old underwear and my mouth just exploded.
My dog ate my homework and I was like 'what the f***' and my mouth stayed open for 10 minutes.
When my mom told me I had to eat brussels sprouts, I just stared in horror and my mouth wouldn't close.