Definition of moonwalk:
(n) :
(dance) A dance move in which the dancer slides backwards though the feet move as if walking forwards; the backslide.
(n) :
(dance) A dance style in which the dancer appears to be moving in a low gravity environment.
(v) :
(intransitive, dance) To perform the moonwalk.
(v) :
(intransitive) To walk in a manner that is similar to the moonwalk dance style; to move while sliding backwards as though the feet move as if one was walking forwards.
(n) :
(astronautics) An exploration of the Moon's surface on foot by an astronaut.
(n) :
(astronautics, by extension) Activity on the Moon, outside any moonbase, exposed to space, by an astronaut