What is a muscle car

I agree with the list, which is odd in its self.
Yep! Challenger! Pony car!
Corvette, sports car.

Hot rod holds two def's in the slang book. The one above is good to cover it in a general manor while the old true meaning comes from the time when you mixed and matched parts to get what your after. IE: Ford body, olds rear, Crysler trans etc.....