Most lyrics have it as>Sha, sha ba da, sha ba da
The Gorillaz wiki has it as>Shake it, shake it, shake it
Personally, I think it's 'shaba daba's, but you're allowed to hear whatever you want. I choose to hear "bitches have to go 'coz they don't know wack" later in the song, myself.
And don't do o.o. It make you look like an idiot.