funnybone

/F AH1 N IY0 B OW0 N/
noun
  1. 1

    The ulnar nerve in the elbow, which, when hit, causes a tingly sensation.

    โ€œOuch, I just hit my funny bone.โ€

  2. 2

    One's sense of humor.

    โ€œHis wisecracks always tickle my funny bone.โ€

Source: https://en.wiktionary.org/wiki/funny%20bone, https://en.wiktionary.org/wiki/funnybone