WhipBack, also known as "WhackBack", is a pain-inducing game played by teens and young adults who use leather belts to create self-inflicted welts on their backs.
A shock site that depicts a repeating video (sort of like meatspin ) of two males having anal intercourse with each other. The one on the bottom is repeatedly humping the other from above, which causes the other male above him (which looks like a girl) to have his penis go up and down like a whip, hence the name "whip crack".
Originating from the idea of ordering the most obnoxious drink at the bar, whipwacker can be likened to an obnoxious person or group - specifically used for bachelorette parties in Nashville.