It's slang. Influenced by Russian. Or it may be a poetic ellipse.
WWW is full of native speakers who can't put together a full sentence in any language.
Let us say it is almost perfect Tallinese. You can make it worse:
Raplas lumi maas?
On Raplas lumi maas?
or the worst:
On ka Raplas lumi maas? (It is horrible, but I can imagine somebody saying that.)