Wiktionary
phr. (context idiomatic US English) (non-gloss definition: Used to return a greeting or insult).
Wikipedia
"Back at You" is a 1996 single by hip-hop duo Mobb Deep. The song was featured on the soundtrack album for the film Sunset Park. The b-side featured another song from the film's soundtrack, "Elements I'm Among" by Queen Latifah.
Usage examples of "back at you".
Afterwards you may be ushered into a different room where hybrid babies or foetuses, partly human and partly like these creatures, stare back at you.
Well, it took us a million years, but we finally figured out a way to get back at you!
Everything is given some pronounced epidermis, something that comes back at you, and it was starting to get to me.
I still think that sleaze you convicted last week may have friends who want to get back at you.
The beast has no idea of himself except as an inferior part of an organism whereof you are the superior part -- he would no more think of striking back at you than you would think of pounding your own head when it punishes you with a headache.
And if you want to start investigations in Starfleet of me, then you'd better be ready to withstand some heavyduty investigating directed right back at you.
Or are you getting scared now, when the monkey in the cage is laughing back at you?
In 1960 there were no levers at all - you just dropped in the bread, and the toaster lowered it and popped it back at you in less than a minute.
There was nothing special about the bread, not really, but the one thing you could count on about freshly baked shore-bread was that you'd never take a bite and see half a weevil-worm wiggling back at you, although he had had to eat weevilled bread, and worse, in his time.