use (one's) coconut

use (one's) coconut

To use one's own intelligence and intellectual ability; to think logically and rationally. In this phrase, "coconut" refers to one's brain. Often said as an imperative. Come on, Dean, I know you can figure this out on your own. Use your coconut for a change! We'll have to really use our coconuts if we're going to have any hope of solving this supply issue.
See also: coconut, use
Farlex Dictionary of Idioms.
See also:
  • (one's) day in court
  • be on (one's) pat
  • (from) top to toe
  • (there's) no peace/rest for the wicked
  • at (one's) doorstep
  • at doorstep
  • (one's) jig is up
  • at will
  • at somebody's expense
  • at (one's) expense