We had a "terror" come in to the vet clinic where I worked and the little beast was indeed a Terrier Terror.
But the "terror" is an actual breed, haven't you ever heard of a Jack Russell Terror?
Before anyone takes offense, let me state that I love Jack Russells, I would never own one, because I don't live on a horse farm, and am too old and fat to keep up with one.
And also, I think mutts are generally fine dogs, my own Maddie, whom I adore, is a mutt, although I didn't pay big bucks for her, as she was found on a city street, lying in the gutter. I just have a problem with people intentionally breeding mutts with cute names to sell solely for profit. Most of todays recognized breeds were created by combining one or more breeds, to come up with a dog that suited a specific purpose the breeder had in mind. Dobermans,Kerry Blue Terriers, Portuguese Water Dogs, my beloved Boxers, just to name a few.
And certainly, anyone who wants to spend a lot of money for a mutt is free to do so, it's your money. If ever I were to actually buy another dog myself, which I won't, having had only rescues over the past twenty years, I would just want to be sure that the parents of the pup were clear of any genetic defect that could possibly be tested for, hip dysplasia, PRF, Addison's Disease,Von Willibrand's and many others. It costs enough to feed and get proper vet care for a healthy dog, much less one who comes up unhealthy due to poor breeding. And you can be sure the puggle, and shih, lhasa, peke or whatever-poo, and yes the cavachon and whatever-doodle breeders out there, however good and kind and loving they may be as people, are not doing genetic screening or testing on the dogs they breed.
After all, that would cut into their profits.