Source is "Dave gets Oprah pregnant":

http://www.comedycentral.com/video-clips/ib7jnp/chappelle-s-show-dave-gets-oprah-pregnant

Higher quality:

Thank you stuff_of_epics for remaking this gif.

Here's an even higher quality one:

http://pandawhale.com/post/31915/dave-chappelle-yes-yeah-sweet-bed-dance-gif

More Dave Chappelle dancing gifs:

http://pandawhale.com/post/25973/dave-chappelle-prince-gif

http://pandawhale.com/post/24763/dave-chappelle-yeah-victory-dance-gif