To reach a point of stress, anticipation, or engaging an act that is so extreme that you clench the cheeks of your buttocks together so tightly, that your taint is effectively welded together.
The taint sometimes has a ridge of skin that runs virtically on it from anus to scrodum, or vagina.. It looks like a weld, or stich mark. I've come to find out that most have this while some do not.
while I was going down on her, I saw that she had a taintweld too. man how many people have these.. God I hope it's not a post operation scar >.<
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi