Jimmy Fallon and will.i.am rap about all things 'Ew!'

You know Jimmy Fallon's teen alter ego Sara? The one who thinks everything is "Ew!"

So, like, she and her BFF mir.i.am (will.i.am) go to a dance, get together in the basement, do some pillow fighting, and sing a new rap song about all the thing they think are "Ew!"

Nice touch: The song is for sale as a digital download on iTunes, with proceeds going to the SeriousFun Children’s Network and the i.am.angel Foundation.