Meaning of funny bone

fun'ny bone"

Pronunciation: [key]
  1. the part of the elbow where the ulnar nerve passes by the internal condyle of the humerus, which when struck causes a peculiar, tingling sensation in the arm and hand; crazy bone.
  2. a sense of humor.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.