Yippee Ki-Yay!

A Stock Phrase, usually delivered as a message of defiance or disrespect to an enemy or oppressor. In contexts where profanity is not an issue it is often followed by "motherfucker" in tribute to the Trope Maker; elsewhere, family- or kid-friendly alternatives are used, or the followup is dispensed with entirely.

The phrase originated as a cheer or cry allegedly shouted by Cowboys in the Old West; like many things from Westerns, it's probably completely fictional. The version seen in the trope name comes from "yippie yi yo kayah", part of the refrain from a 1930s Bing Crosby song, "I'm An Old Cowhand". This eventually mutated in the meme pool to "yippee ki-yay ki-yoh", and from there lost the last two syllables. It still retained its Cowboy connotations throughout this.

Then Bruce Willis (or rather, the screenwriters for Die Hard) got their hands on it, and nothing was the same again.

Not to be confused with Yippee Ki-Yay MF, a 2007 TV show.

Film

 * Alvin and The Chipmunks, Alvin is chased by a guard. When he finds a spotlight to use, Alvin shouts 'Yippee ki-Ya, Mamacita".
 * The Trope Maker and Trope Namer is the Die Hard series, where the entire phrase, including "motherfucker", is the Catch Phrase of John McClane, played by Bruce Willis.

Live-Action TV

 * Network broadcasts of the Die Hard films routinely censor John McClane's Catch Phrase to the inexplicable and incomprehensible "Yippee ki-yay, Mister Falcon!"

Western Animation

 * In The Loud House episode, "Cereal Offender", Lynn screams the line to market shoppers while Lincoln was doing the grocery.
 * In Big Mouth, Monster Horrensess