The Collaborative International Dictionary of English v.0.48:

Hubble-bubble \Hub"ble-bub`ble\, n.
   A tobacco pipe, so arranged that the smoke passes through
   water, making a bubbling noise, whence its name. In India,
   the bulb containing the water is often a cocoanut shell. It
   is a simple type of hookah.
   [1913 Webster] Hubble Telescope

WordNet (r) 3.0 (2006):

hubble-bubble
    n 1: an oriental tobacco pipe with a long flexible tube
         connected to a container where the smoke is cooled by
         passing through water; "a bipolar world with the hookah and
         Turkish coffee versus hamburgers and Coca Cola" [syn:
         hookah, narghile, nargileh, sheesha, shisha,
         chicha, calean, kalian, water pipe, hubble-
         bubble, hubbly-bubbly]