Chhoo-Mantar (also spelled Chhumantar or Choomantar) is a deshaj (locally originated) Hindi/Urdu word which is used for something that disappears suddenly, as if magically.
The word comes from magicians' tricks of making things disappear. The word is a word made up of chhoo and mantar where chhoo means to touch and mantar means a sacred or magical verse, something like abracadabra.