individuals who constantly write meanignless posts to social network sites like Facebook or Twitter.
That nit-twit is constantly posting his location, not realizing we really don't care.
by Tall New Yorker November 27, 2010
A person who constantly tweets, flooding you with inane details about their daily activities.
John is a total nit-twit, I've gotten 20 tweets from him this morning, the most interesting of which being that his cat loved the new cat food.
by golden wench October 14, 2009