Susan Boil 

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.

Susan Boil by Daveinkc August 25, 2009

Susan Boiling 

If the temperature is really hot!

It's fucking Susan Boiling out here

Susan Boiling by Joebay October 17, 2010