yippeekyay 

A slang term originally used by cattle herding cowboys to get their cattle to move faster. Elongated form of the the word yippee, which is used when a person is exuberantly happy about something. Has been used in numerous songs including Country Western, Hip Hop, and even Frank Sinatra used the term in a song. The term was made ultra-popular by actor Bruce Willis, who has used the term in each of his Die Hard film roles. In fact "yippeekyay mother fucker" has become his catch-phrase. Although we come across numerous different spellings of the word, we all understand it's meaning when we hear it.

Hans Gruber's reference to John McClane as a "cowboy" in Die Hard instigated McClane to use the phrase "yippeekyay motherfucker!" In other words "Yee- ha, let's get it on asshole."

yippeekyay by yippeekyay/yipeekyay December 6, 2011

yipeekiyay 

yipeekiyay is a word used for exclaiming ones self satisfaction or ones release of energy through a positive, invigorating manor.

*jumps out of plane saddled on bomb* 'yipeekiyay!!!'

yipeekiyay by Levi godolphin March 29, 2007

Yippeekayay 

This is the most badass word around.
Only true bitchin homeboys who are knocking off the euro trash terrorists may use this word.

"Yippeekayay, mother fucker"

Yippeekayay by Juan Valdez September 16, 2003