Ordinances are laws, rules, or other restrictions levied upon various portions of the city, districts, or locales as seen fit. Generally speaking they are unpredictable in nature, tend to lack much rhyme or reason, difficult to remember due to often changing, and even harder to follow. Ultimately this means Council Pawns can almost always find a justifiable reason to harass or trouble any citizen they choose.
A card game called Whim was created to represent the unpredictable nature of ordinances which are often referred to as "The City's Whims". As a result the term "whim" is used to refer both to the game and as slang for ordinances themselves.
Examples:
One must be eating soup while traveling through this district; soup drinking is not tolerated and will be grounds for severe punishment.