I like the term "nish", have used it for about 20 years, and will continue to use it. But, I will say that I do understand the knee-jerk dislike that some people have for it.
I typically dislike texting lingo. I try not to text when I can call someone, but if I do text, I type like an educated person--not a five year old. I don't say, "U want to see movie?" I'll say something like, "Hey, man. Any interest in seeing Captain America?"
And, if there is one piece of lingo I really dislike, it's "Fail". Can't stand it. Don't like it. Think less of people who use it.
So, I do understand where some of you are coming from with regards to "nish" (not that I'm going to stop using it).