What does it mean when someone says "I'm so over myself"?

I'm not native and I listened this statement in a film, in a contention between lovers:

A: "... Get over yourself"

B: "... I'm so over myself"

Based on the context the meaning should be obvious but I'm a little confused about it.

Solution 1:

It would seem "being over oneself" means no longer being enamored by one's own abilities, looks or perceived value.

The speaker has probably gone through recent happenings that help him/her have a more objective appraisal of themselves and their immediate environment.

Solution 2:

"I'm (so) over {somebody}" is usually used to mean "I used to be in love with {that somebody} but I'm not anymore", while "get over yourself" accuses the addressee of self-centeredness to the point of self-infatuation.

I'm guessing the two are juxtaposed here for comic effect, but context and visual cues would help us figure out what the second speaker meant.