When a serious or heartfelt moment is undercut by something absurd or nonsensical.
This is a reference to a scene in the video
game YIIK: A Postmodern RPG. When the character Rory is bearing his soul about his deceased
sister, and Vella is sympathizing with Rory's grief. The emotional scene is interrupted by a Golden Alpaca who keeps saying Lemonade, with goofy background
music playing as you're thrown into combat against them.
My
brother Kevin had a hell of a Golden-Alpaca Moment at the wedding. He
shat himself directly into the sky when it was his turn to say "I Do."
I'm still
cleaning the feces out of my tuxedo.