A fork of Rural Dictionary
The sound that one makes when irritated, frustrated or just pissed. Very popular in the urban world. Sounds like a leaking tire.
The Flat Tire:
Cop: Put your hands on the car.
Urban Kid: Psssssssssssssssssssssssssssssssssssssssssssssss maaaannnn (imitating the sound of a leaking deflating flat tire)