Hi - I am Disco's owner, and yes, he's real. Parakeets (budgies) are small, but very capable speakers (they mimic) if owners spend a lot of time with their bird, don't have other birds of the same species with them, and, generally, they have a male bird. We got Disco at a young age, which also helps - the younger they are, the easier it is for them to learn/mimic. :)
This is not Disco's most recent video - this one is, and it's pretty funny: http://www.youtube.com/watch?v=yCFNyKNNpNE&feature=g-upl