Gerrarahia! That’s one crazy Nigerian slang everyone says. Most times, people say it to just get people laughing. Other times people say it to express anger.
Say gerrarahia as much as you will but definitely not in these annoying moments:
1. When MOPOL seizes your wallet
Remember what Mama always said, “silence is the best answer”
2. When someone hits you car
Of all the many things you’ll be thinking of then, gerrarahia won’t be on the list
SOURCE:http://kokofeed.com/2015/11/05/10-angry-situations-you-dare-not-say-gerrarahia/