It's a light-hearted love song about not taking things so seriously. He is introducing himself to a girl in the song also. 'I'm yours' is about the same as saying 'I love you'. Essentially, 'My heart belongs to you'. Hope that helps. English uses so many non-literal sayings, and understanding song lyrics (or poetry) is about as difficult as it will get for non-native speakers. http://www.youtube.com/watch?v=EkHTsc9PU2A I'm Yours lyrics Songwriters: Mraz, Jason; Well you done done me and you bet I felt it I tried to be chill but you're so hot that I melted I fell right through the cracks, now I'm trying to get back Before the cool done run out I'll be giving it my bestest And nothing's going to stop me but divine intervention I reckon it's again my turn to win some or learn some But I won't hesitate no more, no more It cannot wait, I'm yours Well open up your mind and see like me Open up your plans and then you're free Look into your heart and you'll find love love love love Listen to the music of the moment people, dance and sing We're just one big family And it's our God-forsaken right to be loved loved loved loved loved So I won't hesitate no more, no more It cannot wait, I'm sure There's no need to complicate, our time is short This is our fate, I'm yours D-d-do do you, but do you, d-d-do But do you want to come on Scooch on over closer dear [ From : http://www.elyrics.net/read/j/jason-mraz-lyrics/i_m-yours-lyrics.html ] And I will nibble your ear I've been spending way too long checking my tongue in the mirror And bending over backwards just to try to see it clearer But my breath fogged up the glass And so I drew a new face and I laughed I guess what I be saying is there ain't no better reason To rid yourself of vanities and just go with the seasons It's what we aim to do, our name is our virtue But I won't hesitate no more, no more It cannot wait, I'm yours (I won't hesitate) Open up your mind and see like me (No more, no more) Open up your plans and man you're free Look into your heart and you'll find that the sky is yours (It cannot wait, I'm sure) So please don't, please don't, please don't (There's no need to complicate) There's no need to complicate (Our time is short) 'Cause our time is short (This is our fate) This is, this is, this is our fate I'm yours

I just googled this song. If you add one word in between I'm and yours it will help. The word is "completely". If you look at what he said right before I'm yours: "But I won't hesitate no more, no more, it cannot wait-- I'm yours" I think he saying he's not going to waste any more time pretending or withholding anything. He's now completely giving himself to her/surrendering. "I'm yours"