ANSWER: We're heading to the jungle for this one - this particular sound was the "Tarzan yell" made by Pitfall Harry in the Activision game "Pitfall" for the Atari 2600 game system. It was the easiest way to get across the alligators (instead of having to jump on their heads, which was a bit trickier).
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Keith Shaw rounds up the best in geek video in his ITworld.tv blog. Follow Keith on Twitter at @shawkeith. For the latest IT news, analysis and how-tos, follow ITworld on Twitter, Facebook, and Google+.