My dictionary, for when the Urban Dictionary doesn't have it or gets it wrong.

Blue Cesspool   The urban population of large cities in the U.S. ruled by Demoncrats. Hundreds of thousands (approaching or exceeding a million in some) of low-quality specimens fed, housed, and provided with entertainment by taxpayer funds, they are both helpless in terms of surviving in the wild and without even minimal self-restraint and are useful for forming mobs to do the bidding of leftist organizations.