A childhood belief about misheard lyrics

There's this commercial for the Drug-Free America campaign, where this cowboy is in the middle of the street playing a guitar and singing, but he's had a tracheotomy so he was using that little box that gives you a robot voice. Anyway, he's singing stuff like "you don't always die from tobacco, sometmes you just lose a lung" and then at the end he says "yippie yi yo ki-yay". I always thought he was actually saying, "Happy Holidays!"
I never really thought about the fact that it was April, and no holidays were taking place...