A celebrity or just plain douche that uses twitter very little to join the fad and calls them self a nerd or a geek for using twitter and then laughs it off thus amusing them self and insulting nerds, geeks, and the whole serious twitter community all at the same time. Often are Twits
A Twirp commonly brings up the fact they use twitter at inappropriate times to make themselves feel hip and interesting. sometimes, Twirps are older cougars
trying to feel young, only too look like an bitchy old chick
Joe: Dude, you know that old cougar whos at the bar all the time got a twitter?
Bob: Yeah man, she said she was a nerd cuz she like twatted once!
Joe: Damn what an old, dried up Twirp!