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.

Hatch \Hatch\, n. [OE. hacche, AS. h[ae]c, cf. haca the bar of a
   door, D. hek gate, Sw. h["a]ck coop, rack, Dan. hekke manger,
   rack. Prob. akin to E. hook, and first used of something made
   of pieces fastened together. Cf. {Heck}, {Hack} a frame.]
   1. A door with an opening over it; a half door, sometimes set
      with spikes on the upper edge.

            In at the window, or else o'er the hatch. --Shak.

   2. A frame or weir in a river, for catching fish.

   3. A flood gate; a a sluice gate. --Ainsworth.

   4. A bedstead. [Scot.] --Sir W. Scott.

   5. An opening in the deck of a vessel or floor of a warehouse
      which serves as a passageway or hoistway; a hatchway;
      also; a cover or door, or one of the covers used in
      closing such an opening.

   6. (Mining) An opening into, or in search of, a mine.

   {Booby hatch}, {Buttery hatch}, {Companion hatch}, etc. See
      under {Booby}, {Buttery}, etc.

   {To batten down the hatches} (Naut.), to lay tarpaulins over
      them, and secure them with battens.

   {To be under hatches}, to be confined below in a vessel; to
      be under arrest, or in slavery, distress, etc.

Source : WordNet®

booby hatch
     n : pejorative terms for an insane asylum [syn: {Bedlam}, {crazy
         house}, {cuckoo's nest}, {funny farm}, {funny house}, {loony
         bin}, {madhouse}, {nut house}, {nuthouse}, {sanatorium},
         {snake pit}]