The winner:
Blueberry Cinnamon Crumble, and it etched a poly tank. I would have lifted a cat's tail and licked to get the taste out of my mouth. Fortunately, there were no cats handy at the time. I did squeeze the toothpaste tube directly into my mouth, though. It reminded me of Pet Detective.
Wow glad I started to read this thread cause that was one of the flavors Ive been thinkin of ordering and im pretty sure i was about to order it from the same place you got it from cause ive only seen that flavor at 1 vendor.
Anyway worst ever huh? its gotta be DooDooMcPoo, taste like it sounds. Naa, messin, ha. But really the worst ever was a mocha latte which I normally love (just shows you some vendors are vastly superior to others) but in this case tasted like cat urine with a high ammonia content. Really. Reaallllyyy. Yep.