What is "Cha Cha Slide" ??

Today David tweeted about "Cha Cha Slide" was playing in a restaurant where he's staying at that moment...

so,because i don't know what "Cha Cha Slide" is..i searched it on google *LOL* (Thanks David for the homework). 

and here's what i got:

"The "Cha Cha Slide" is a song often played at dance clubs, school dances/proms, parties,skating rinks and weddings in Canada, the United States, Australia, New Zealand, Ireland and the United Kingdom (the song reached number one in the latter country in 2004), created byChicago's DJ Casper (Willie Perry aka Mr. C the Slide Man). The Cha Cha Slide is a line dancewith called instructions. Writer: William Perry Producer: Men On Business."

The whole information about "Cha Cha slide"

Cha Cha slide

(source: Wikipedia)