Face-forearm
You're so annoyed and embarrassed you hit your face with your forearm like it's your only friend.
When my teacher called my dog 'Mr. Fluffy' in front of everyone. Face-forearm. #dognamefail
I told my crush I liked him and he told me he had a crush on his dog. Face-forearm. #dogcrush
I spilled my cereal on my shirt before school. Face-forearm. #cerealdisaster