To render one's anus or vagina in a
graphical state of distress, as a result of a particularly violent bowel movement or penetrative intercourse.
The description comes from the similar appearance to the ripped edges of a
windsock (an item of metrological equipment used to establish wind speed/direction) as used at airports/flying schools, etc., which have become
tattered as a result of excessive weather conditions.
Example:
"God, that curry last night was awesome - my arse puckered starrusty
sheriff's badgechocolate
tea towel holder this morning was like a tattered windsock"
"He was hung like a horse; my twat vadgegrowleryeti's
welly looked like a tattered windsock afterwards"