I'm just a little too not over you

[Blue_Snow]

What does the expression mean?

[Beeesneees]

This is a silly (IMO) expression, which seems to belong in the same class as the title of the film "I'm just not that into you."

The easiest way to look at it, for my mind is to split it into two:

"I'm not over you." The speaker has probably had a relationship with the person who is the object of the sentence, (either that or a crush on them) and although the relationship has now ended the speaker still has feelings for the other person.
"I couldn't go out with Rob, because I'm not over Pete yet - it wouldn't feel right."

"I'm just a little too not..." This is the silly (IMO) part, which deliberately displays poor grammar.
"I'm not quite..." (Not as much as I would like to be, possibly)

So, put sensibly, it is, "I'm not quite over you." This may well be combined with 'painful' feelings, and a wish that things were different...
"I'm not quite over you, but I wish it was, because my continued feelings mean I am still emotionally hurting. If I were able to change my feelings to become a little more indifferent to you then the hurt would go."
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Cheers m' dears!

[Blue_Snow]

Did you mean it is the same as I still can't forget you?

[Beeesneees]

That's part of it, yes... but I think that the deeper implication is of the wish the speaker has to be able to forget the person.
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Cheers m' dears!