Haiktastic
When your mouth becomes a big O so wide you're like 'what the f*** just happened' and you can't stop looking like a confused animal.
I heard my mom was going to get a divorce and my mouth just stayed open like a surprised cow.
When I won the lottery and my mouth just went O and I couldn't stop smiling.
When my teacher yelled at me and I just stood there with my mouth open like a confused parrot.