The Collaborative International Dictionary of English v.0.48:

Mae West \Mae West\ prop. n. [after Mae West (1892-1980) an
   actress with a well-developed bosom.]
   An inflatable life jacket, originally used as a personal
   flotation device by aviators downed at sea.

   Syn: air jacket.
        [WordNet 1.6] Maegbote

WordNet (r) 3.0 (2006):

Mae West
    n 1: United States film actress (1892-1980) [syn: West, Mae
         West]
    2: an inflatable life jacket [syn: Mae West, air jacket]