A definition of "wedgie", from this site: http://www.odps.org/slangw.html

wedgie n. Humiliation where the underpants are pulled sharply upwards from behind, causing them to wedge themselves tightly up the victim's arse-crack.

Variations:
* Pure wedgie: The victim is only wearing underpants when the attack occurs, thus inflicting a much greater amount of embarrassment than normal.
* Super wedgie: Pure wedgie but with the assailant then grabbing the crotch of the victim's underpants (from behind as it is exposed) and continuing to pull, resulting in the victim's genitals being revealed. (This is particularly embarrassing if the victim is not quite flaccid.)
* Wedgie war: All-against-all with lots of ganging up, normally in a swimming pool. A good attack is considered to be when the victim is lifted out of the water by his swimming togs to at least his knees. (Note that this activity can be very deleterious to the well-being of swimming togs.)
* Wedgie-proof: The victim's underpants are so stretchy that the wedgie doesn't hurt, or they are wearing Speedos, which tend to just stretch instead of heading painfully for the buttcrack. Can refer to the person or the apparel.
* cf. scanting USA, variations from NZ


...Okay, now it's my turn: what exactly is "sparkled" in the context in which PP is using the term?