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An emphasis on the word Stupid. Used when you think something is stupid but at the same time do not really mind it too much. The more "u's" that are in the word, the more you think something is stupid. It is sometimes used when you want to annoy someone
Person 1: "I bought a bike today but it was pink unfortunately."

Person 2: "Stuuuup."

Person 1"Aww common it is not that bad."

Person 2" "Stuuuuuuuuuuuuup"

Person 1: Thats really anoying..."
by TheVeryIntelligentPerson May 24, 2011