Being the final straw - Idioms by The Free Dictionary
be the final straw (redirected from being the final straw)
be the final straw
To be the last in a series of negative actions or events that makes the situation no longer tolerable. I'm already fed up with your lazy, selfish behavior, Jim, but if you can't be bothered to come with me to my own mother's funeral, well that will be the final straw!
be the last/final ˈstraw (also be the ˌstraw that breaks the camel’s ˈback) be the last in a series of bad events, etc. that makes it impossible for you to accept a situation any longer: I’ve had a terrible day, and this traffic is the last straw, I can’t take any more.