whats that song from the commercial called?

This sounds like it

http://www.hardees.com/news/14

"...The ad, titled "Cow Shake," features a young guy pushing against a large Holstein cow in rhythm to the music of the hit single, "Get Busy," by Jamaican reggae star Sean Paul. As Paul sings "shake that thing," the young man attempts to move the rigid black-and-white bovine, whose udder vibrates back and forth with the music. The pay-off line is "Milk … Shakes." ...."

ooh thank you so much!!!

Your very welcome!

The internet can be such a great tool, for questions just like this.