A person that lives in the city, whether it be big or small, or elsewhere that is not on the open sea, that partakes in the ritual of stealing anything he can get his hands on.
In the plural sense, a band of urban pirates may go and steal things because they are bored, not just because it makes them feel good.
John: I'm bored.
Kyle: Me too.
Sarah: Me too.
John: Let's go steal something!
All: Okay! *Urban pirates get up and leave their dwelling to plunder a street sign, rum, or whatever else may look appealing to them at the time*
One who sits in wait for another to fart, then quickly inhales the gas directly from the sphincter before anyone else can enjoy it. Usually an ass whooping ensues.
"I had the best fart today but before I could smell it some fart pirate came and stole it."