Danerys i think is a charachter in the Game Of Thrones books and tv series who must have said something like this at some point. I thought it was a quote from Hannibal of Carthage but google just turns up the simpsons and a Thai marshal arts film when i search for the phrase.
Actually it is not necessary to use a verb here. "Gdzie moje słonie?" is also okay and it's normal to omit a verb here. However, I realise it may be confusing for beginners.