Nope.
Nope but I’m generally out of the loop on these things anymore. :o
Another nope from a Dope®.
Yes.
No
Yes, I knew that usage.
Oh, on the Camaro it wasn’t for functionality…just looks. Although I thought it also helped create some downforce on the back end if it were going fast enough.
Urgh.
And yes, I had heard of it.
Put me in the never heard it before camp.
Yes
Yes
Yes. I first heard of it in 2006; it was listed under the “don’t” section of my school’s dress code in the handbook, along with a picture.
Yup.
Yes.
I hate thongs.
Yes.
Yes.
Yes
Yes, in reference to a visible thong. No, in reference to a car spoiler.
The Wikipedia article on the term was started on 19 January 2006: “whale tail n. the appearance of thong or g-string underwear above the waistband of pants, shorts, or a skirt.”
Especially if you affect a speech impediment that makes your "d"s sound like "h"s 
I knew both - the Porche one was first, obviously. My understanding of the Whaletail was that being a rear-engined rear-wheel-drive car, the 911 was prone to losing the back end while cornering hard, so the whale-tail was there to increase backend traction.
And I don’t like the other sort of whaletail at all.
Si
Yes