When a person does or says something that pisses you off, instead of letting their irrelevant ass get to you, their name becomes "Felicia". You can then say the words "Bye Felicia" as a way of dismissing them from your life, and showing them they hold no relevance to you.
Person: You're a little bitch.
You: I dont have time for your bullshit you know, Bye Felicia!
Person: Who is Felicia
You: Who are you?