We found one dictionary that defines the word tickle someone's funny bone:

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1. tickle someone's funny bone: Wiktionary

Definitions from Wiktionary (tickle someone's funny bone) ▸ verb:  (idiomatic) To amuse someone. ▸ Words similar to tickle someone's funny bone ▸ Usage examples for tickle someone's funny bone ▸ Idioms related to tickle someone's funny bone ▸ Wikipedia articles (New!) ▸ Words that often appear near tickle someone's funny bone ▸ Rhymes of tickle someone's funny bone ▸ Invented words related to tickle someone's funny bone