RhymeZone: looky-loo definitions

Definitions of looky-loo:

noun: (informal) One who looks or stares; a gawker; a nosy or overly inquisitive person.
noun: (informal) A look at something; a glance; an opportunity to look around.
noun: (slang) A person who comes into a store and looks around but doesn't buy anything.

(Definitions from Wiktionary)