Source : Webster's Revised Unabridged Dictionary (1913)

Bopeep \Bo*peep"\, n. [Bo + peep.]
   The act of looking out suddenly, as from behind a screen, so
   as to startle some one (as by children in play), or of
   looking out and drawing suddenly back, as if frightened.

         I for sorrow sung, That such a king should play bopeep,
         And go the fools among.                  --Shak.

Source : WordNet®

bopeep
     n : a game played with young children; you hide your face and
         suddenly reveal it as you say Boo! [syn: {peekaboo}]