peekaboo
noun
Definitions
(games) A game for a small child in which one covers one's face, then suddenly reveals it, saying "Boo!" or "Peekaboo!".
verb
Definitions
To peep out.
adjective
Definitions
(of clothing) with holes, slits or transparent fabric to reveal what is normally hidden.
Example: The model was wearing a peekaboo swimsuit.
interjection
Definitions
Boo (when showing oneself unexpectedly)