It says "Yo listen up here's the story about a little guy that lives in a blue world" and then is Dabadee dobadoo repeated several times. It has more lyrics but I forget them now.
Eifel 65 - Blue https://www.youtube.com/watch?v=68ugkg9RePc
"Eiffel 65 is an Italian musical group consisting of Jeffrey Jey, Maurizio Lobina and Gabry Ponte. They are known mainly for their high-charting singles "Blue (Da Ba Dee)" and "Move Your Body", and their 1999 studio album Europop. Their next two albums, Contact! (2001) and their 2003 self-titled album, did not have significant international success, but charted in Italy." -Wikipedia