1. Used as same as LOL(laugh out loud). Originally adapted from an ad in Malaysian TV in the 90s which is about a chocolate dipping biscuit called Nini. The theme used was very funny so every time others joke about something or laughing, "nini" is expressed. Also applicable in chatting messengers.
2. vulgar Replaceable word with "shit"
1. He lost a game of chess with his little sister? Nini!