Top Definition
A boil or cyst that doesn't appear to be very big, but when you pop it, a massive amount of pus comes out. It surprises you like Susan Boyle.
That little boil on my arm looked like a whitehead, but turned out to be a susan boil.
by Daveinkc August 24, 2009

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Lotsa space for your liquids.

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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