And, perhaps, the "yee hah!" of the odd overexcited rider.

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What is the meaning of 'yee hah.'
Hah (or Ha) is an interjection showing surprise of joy. Then what about 'yee'?
Do people use 'yee hah'?

1 answer

People use "yee hah" when they're yelling for joy -- usually at rodeos, but sometimes when their team (baseball, football, whatever) is winning!

http://www.urbandictionary.com/define.php?term=yee%20haw