Definition of "truth serum" []

• Any of various hypnotic or anesthetic drugs, such as scopolamine or thiopental sodium, used to induce a subject under questioning to talk without inhibition. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Put a little truth serum in me and you’ll find out that Tori Spelling goes by Chloe Birkin, rescues dogs in her spare time, and would rather not use packaged marshmallows anymore."