This emoji symbolizes the feeling when you are very/regularly/extremely mad about who or what that person said ( duh because it's a mad emoji.). In simpler words, you are mad and if you used/received that emoji, that means that the don't want to talk to you or you don't want to talk to him/her.
Don't do the following:
Don't ask...
-what's wrong?
-can I do anything to help?
-forgive me
Because that would just annoy that person and get them more mad at you.
