This sound is from Ali G Soundboard

Ali G first appeared as the "voice of da yoof" on Channel 4's The 11 O'Clock Show in 1998. He subsequently became the title character of Da Ali G Show in the early 2000s. He was also the titlecharacter of the film Ali G Indahouse.
See also: Ali G Indahouse, Da Ali G Show, Sacha Baron Cohen, List of Da Ali G Show episodes, Borat Sagdiyev, and Ali G Indahouse Da Soundtrack.