search me


I don't know the answer to that, as in Where's John?—Search me, I haven't seen him for weeks. This expression in effect means “you can investigate me completely for the information you want but you won't find it.” [Slang; c. 1900]

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.