Definitions by Ms. Guppie

purple sock 

Phenomenon occuring during anal sex, when the penis is partially retracted from anus quickly, slightly drawing out the purple-hued interior wall of from the sphincter, creating a sock-like effect around the penis, e.g. a "purple sock" pulled over the penis.
See Harry Mount

your purple sock is draging on the ground

purple sock by Ms. Guppie October 8, 2003

purple sock 

Phenomenon occuring during anal sex, when the penis is partially retracted from anus quickly, slightly drawing out the purple-hued interior wall of from the sphincter, creating a sock-like effect around the penis, e.g. a "purple sock" pulled over the penis.

Mount gave Ms. Gupie the purple sock of a lifetime. (3 feet long)

purple sock by Ms. Guppie October 8, 2003