The lyrics go something like - you know when you *tweet* *tweet* you get the best of me and when you *tweet* *tweet*...
Light fluffy song - the tweets are the whistles... just heard it - have spent the last two hours on YouTube and itunes... please help!

Think it's probably Skinny Genes by Eliza Doolittle :)

http://www.youtube.com/watch?v=H8fRqKu9qDA

YAY! YOU ARE FABULOUS. Thank you... :D This is the song.

Happy to help :)