An insult meant for females. Formed from the combination of the words twat, clit, and idiot, indicating that the female is so insipidly stupid she couldn't think her way out of a paper bag.
A toidiot or twidiot is a person that writes utterly foolish or senseless crap on the internet especially on twitter and facebook or any other social networking site.
Joe Blow posted on twitter that he didn't know who Michael Jackson was. Joe Blow is a toidiot