The Oxford Thesaurus An A-Z Dictionary of Synonyms - shoointerjection.

1) Scat!, Go away!, Away with you!, Be off!, Get out!, Begone!, Colloq Get lost!, Beat it!, Scram!: I shouted 'Shoo!' and the chickens scattered. --v. 2) Often, shoo away or off. scare off, frighten away, drive away, force to leave: She shoos away anyone who disturbs her while she is painting.