An interesting word. It means ‘not in my backyard’.
After I posted this, some viewers/friends asked me to tell them how to use this word. So I have copied below the entry for the word ‘nimby’ from Cambridge Advanced Learner’s Dictionary. I hope it helps.
Nimby /” noun [C]
ABBREVIATION FOR not in my back yard: a person who does not want something unpleasant to be built or done near where they live:
The spokeswoman said that Nimby attitudes were delaying development of the site.

nimbyism /” noun [U]
Residents were accused of nimbyism when they tried to stop the new superstore development.