I think it depends on whether the whale tail is sticking out just a very little bit or whether it is sticking out like by 2 inches. If it is sticking out a lot, it is pretty much slutty and over-stated. If it is just a little and can mostly just be seen when the person bends over...then it is fine. It can even by a little flirty. I wear thong panties and low-rise jeans and my thong is not usually visible. However, there are a few thongs I have that wear a little higher and I've been told a few times that I have some thong showing. It doesn't really bother me.
Trashy. It’s pretty easy to buy thongs that DON’T stick up above your pants and shirts that overlap with your jeans, so it’s pretty obviously on purpose IN ALMOST ALL CASES. Not cute, imo. If you are trying to show off for your guy, give him the whole show, but don’t give the whole world a peek. It’s just not special any more if anybody within a mile’s radius knows about it. Keep some mystery!
Nasty nasty nasty nasty nasty nasty nasty All I can say is.nasty. lol. It looks gross and it's not like I ever look at girls, some of them just bend over at random at school and I'm like wtf!? crazy people and their nasty whale tail lol.