Top Definition
The cylindrical cardboard center of the roll of toilet paper, so called because if you put it to your lips and make a sound like a trumpet, you say "dut-dut dut-dut."
Be sure to throw away the dut dut when you put the new roll of toilet paper on. Also, we needed to bring a bunch of dut duts to school to make an art project.
by Elsbeth January 24, 2007
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