A mental disorder -- originated in singapore -- that makes the sufferer believes that his country (i.e.: singapore for singaboreans) is a beacon of morality, clear conscience, democracy and high-civilization in the region (south east asia for singapore case).
However it also applies to people of other nations.
WHO (world health organization) chief: "Hey, we only have 99 names in our list of mental disorders."
His assistant: That's because we took homosexuality out back in the 70's.
WHO chief: Well, just put singdrome in, then we'll have a perfect list of 100 disorders.