I'm not sure about "I'm sophomore 15," but I've heard the term "I'm audi 5000" in a movie once. I think it was "Clueless", with Alicia Silverstone, and I believe she said as a sort of slang-pun, combining the term "I'm outtie," as in "I'm out, leaving, on my way," with a luxury car model (Audi 5000, or was it 3000?).
Hope this helps!
They don't make much sense.
An Audi 500 is a type of car.
"I'm an Audi 500" means someone is saying he is a type of car.
A "sophomore" is an American English word for someone in the second year of high school or university. Many high-school sophomores are about 15 years old. However, "I'm sophomore 15" makes little sense. You could say instead:
"I'm a sophomore and 15 years old."
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