slang One's head or brain. Sometimes hyphenated. There doesn't seem to be much activity in that think box of his. Come on, Janet, that was a dumb mistake. Use your think-box for a change! The mob boss ordered his goons to put a hole in the witness's think box.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
n. the skull; the head. Use your think-box for something other than to hold your ears apart.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.