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1.
That scared feeling you get when you've fallen hard for someone. That in between like and love phase.
"Girl, where did you come from?
Got me so undone,
Gazing in your eyes got me singing what a beautiful lady
No "if"s, "and"s or "maybe"s
I'm releasing my heart and it's feeling amazing
There's no one else that matters"
by icantloveyouanymorethenthis December 22, 2012
 
2.
To be in a complete state of happiness after a large amount of luck. Opposite of 'getting done'.
For example being on staff travel benefits meaning your whole life is a holiday because your parents worked for an airline. That is getting 'undone'.
by josno August 01, 2013
 
3.
The best song ever. Also known as The Sweater Song. By a little band known as Weezer. (Weezer is NOT an emo band. you fucktards who think they are...)
If you want to destroy my sweater
Pull thread as I walk away
Watch me unravel, I'll soon be naked
Lying on the floor, lying on the floor
I've come undone
by Ka January 27, 2005
 
4.
The best song ever by Lifehouse on their self-titled album.
"Tell me everything you want now, anything at all, and I will be the one waiting anytime you fall."
by musicworthy April 15, 2005