Gif Central boasts hundreds of funny animated gifs. Only the best of the best make it onto this site, with most of them having an accompanying source. No tumblr-esque one-second-long disappointments. No obscure titles or descriptions.
This is animated gif of a dance from the BalloonShop dance competition. The title of the Youtube video is "Pump It Up! Burn It Up! Dance Contest". This is often used as a reaction gif whenever somebody is extremely pleased with themselves.