“Nostrovia” is an English mispronunciation of the Russian word “Na Zdorovie”. Outside of Russia, Na Zdorovie is commonly known as a drinking toast.
Na Zdorovie (Naz-dro-vyeh) means “You are welcome”.
Nostrovia is modern slang for “let’s get drunk” and “let’s drink”. More commonly though, it is just used as a simple drinking toast, such as “to your health!” or “cheers!”.
Cheers to you!