Green’s Dictionary of Slang

(US teen) goodbye; used as a simple farewell or as an aggressive dismissal or statement of distrust.

2008		Urban Dict. 7 Dec. 🌐 bye felicia When someone says that they're leaving and you could really give two shits less that they are. Their name then becomes ‘felicia’, a random bitch that nobody is sad to see go.
2016		C. Eble (ed.) UNC-CH Campus Sl. Fall 2: BYE FELICIA — sassy goodbye: X: ‘I’m going to study. See ya’ Y: ‘Bye Felicia’.
2019		www.verywellfamily.com/a-teen-slang-dictionary 10 Mar. 🌐 Bye Felicia - A disrespectful way to dismiss someone who is unimportant.