A fork of Rural Dictionary
The taking down of pants and moving of hips from side to side causing a flapping sound of the penis.
Roger was mad at the others inside of wendys so he gave them the flapper from outside.
An uncircumcised penis that gets jerked off to the point of climax and you leave the semen in the uncircumcised flaps.
Klinton has a nice flapper wagon! Did you see his flapper wagon? It really held his cum.