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.
The characters Bella Swan and AnaSteele are such a twidiots.
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.