Meaning of the word "the final last straw" in English

What does "the final last straw" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

the final last straw

US /ðə ˈfaɪnl lɑst strɔ/
UK /ðə ˈfaɪnl lɑːst strɔː/

Idiom

the last in a series of unpleasant events that finally makes you unable to accept a situation any longer

Example:
His constant complaining was annoying, but leaving without saying goodbye was the final last straw.
After weeks of delays, the cancellation of the flight was the final last straw for the frustrated passengers.