Five is just barely enough to merit a launch, but there have to be more examples out there.
Topic on Talk:Yippee Ki-Yay!
Just added one to Music. Could it be the Ur Example?(I don't recall how old the song is.)
It isn't the Ur Example -- the Bing Crosby song mentioned in the main text is older by 12 years (1936 vs. 1948 for "Ghost Riders"). But neither is an example of the trope defined here, which is the modern use of the phrase to indicate defiance or disrespect in the face of an enemy...