Wiktionary
n. (context slang English) A small addition to a burden which causes it to exceed the capacity.
Wikipedia
Final Straw is the third studio album by British alternative rock band Snow Patrol, released in the United Kingdom and Ireland in 2003 and in the United States in 2004. The album is notable for bringing the band their first mainstream success outside of their native countries of Northern Ireland and Scotland. It is the first album to feature lead guitarist Nathan Connolly and the last to feature bassist Mark McClelland.
The album was re-released in the UK in 2004 with two extra tracks, before being exported to the U.S. (without the bonus tracks). The album was also released on SACD and DualDisc with 5.1 Surround mixes.
Usage examples of "final straw".
All of Lalo's previous insults added to his ire, and this one was the final straw.
Then they chose to mess with me, which was the final straw, and they got what they got.
It seemed to come from everywhere and nowhere, and for Jake it was the final straw.