What is I'm a stupid doodoo butt?

Sans' secret code in undertale.

Sans: "What's up."
Frisk: "I'm a stupid doodoo butt."
Sans: "Did you...did you just say 'I'm a stupid doodoo butt?'"
"Wow. I can't believe you would say that."
"Not only is that completely infantile...but it's also my secret codeword."

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I'm a stupid doodoo butt - video