Good question, thexflash. It's a word in the lyrics of the songs 'Shake, Rattle and Roll', 'Honey Don't' and 'The Girl Is Mine'. It's used "to express feelings of annoyance, surprise, or pleasure". It could also mean that a dog has gone.
I agree, she chose to go her own way, much like Mandy Flores. I can only respect that, but still....especially Allie could have been really huge, no doubt about that in my mind.