• (v. i.) To practice ventriloquism; to speak like a ventriloquist.
Ven·tril'o·quize intransitive verb [ imperfect & past participle Ventriloquized ; present participle & verbal noun Ventriloquizing .] To practice ventriloquism; to speak like a ventriloquist. 
ventriloquize, ventriloquizing 1. To practice ventriloquism. 2. To speak like a ventriloquist. 3. To produce vocal sounds that seem to come from somewhere other than the speaker.