If someone calls you a “lil piss boy” it means not only are you a lil BITCH but also a person who gets zero play and is most likely extremely self absorbed.
Kenny: “Drake you a lil piss boy!!” (you’re a lil bitch”
When a guy takes his hard dick, after having anal sex and swings it as hard as he can, hitting a person (hopefully a girl) on her cheek with his penis. If done correctly it will leave a mushroom imprint for several minutes with a lasting red spot afterwards and a nice brown mushroom stain.