Source : Webster's Revised Unabridged Dictionary (1913)

   {Booby hatch} (Naut.), a kind of wooden hood over a hatch,
      readily removable.

   {Booby hut}, a carriage body put upon sleigh runners. [Local,
      U. S.] --Bartlett.

   {Booby hutch}, a clumsy covered carriage or seat, used in the
      eastern part of England. --Forby.

   {Booby trap}, a schoolboy's practical joke, as a shower bath
      when a door is opened.

Source : WordNet®

booby trap
     n 1: an explosive mine hidden underground; explodes when stepped
          on or driven over [syn: {land mine}, {ground-emplaced
          mine}]
     2: an unforeseen or unexpected or surprising difficulty [syn: {pitfall}]