whaletail 

A whale tail is the effect that happens when a girls G-string or Thong becomes exposed as she walks, bends over or squats. Actually whenever you can see that wonderful exposed thong in the shape of a whale's tail. Lowrise jeans and higher cut thongs are creating for extremly great Whale Tails around as more and more thongs become exposed.

When Allison was bent over to tie her shoe her pink thong rose up and I saw a magnificent whaletail.

whaletail by Miles Dyson December 17, 2005

whaletailing 

When the underlines of the thongs show.

I was writing on the board in class, my hot, blonde, late 20's biology teacher bent down behind her desk with her g string whaletailing.

whaletailing by holamihola September 9, 2018