This is a dance that you do when you accomplish something extraordinary. Like hitting a homerun or getting a hat trick or something like that. You pretend to unzip your pants and use your arm to pretend to slam your dick on the ground while making a thud sound.
*johnny hits homerun
Teammates- hit that long shlong
Johnny- ok bet
*johnny performs the long shlong on home plate
A penis so long Chinese people refer to it as the chinese Dragon. ;)
John: "Yo what up Stacy, wanna see my long shlong"
Stacy: "i would die for that baby" ;)
Random Asain dude: "Be Careful little girl, that's the chinese dragon of the myths"