Turd Surfing occurs when you surf a local jettie, or water outlet, where water drains from the streets, into the sewer, into the riverbed. Ever notice why the water is always warm? Yeah, thats poo and pee. Ironically, the surf is usually always good, near turd surfing locations.
"hey fuckers, stop dumping shit in the street drains, no one likes to eat a peice of poo when they go turd surfing"