The meaning of "all ears" is:
The definition of "all ears" is:
(adjective) extremely interested in what someone has to say
A: Do you want to know why I broke up with my girlfriend?
B: Yeah, I’m all ears. Tell me
The employees were all ears while the boss was talking about who was going to get fired.
Wife: Are you listening to me?
Husband: Yes, I’m all ears.