What does it mean when a girl bites her lower lip while looking at a guy?

Anonymous
Well, I have been getting muxed signals from this girl. Although we talk and joke a lot, she gets mad and annoyed at me randomly even after a great, funny conversation.

Recently I have noticed she gives me sly looks, smiles and laughs a lot (while still being moody randomly) but then the other day, we were joking around and I made a funny, smartass comment that made her smile and then we made eye contact and I noticed she was biting her lower lip, she looked extremely cute but I didn't mention anything just so I didn't embarrass her. Is there usually a specific meaning behind that or not?
What does it mean when a girl bites her lower lip while looking at a guy?
5 Opinion