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Actually it's Sherbet. People constantly mispronounce it though, so they misspell it, also.
now i never even watched the muppets or whatever this is (forgive me) but i'm pretty sure it's meant to mean "sure bert"
I know, but the joke is mispronouncing the word. So, if you used the actual word, this wouldn't be a joke, it'd just be a question and someone responding saying "Sherbet."
Because Sherbet is a soft serve (like ice cream) that was the joke.