The phrase "I'll twat you one" is closely linked to this word.
Guy 1: My Grandmother was looking at my porn collection yesterday...
Guy 2: Jesus man, what did you do?!
Guy 1: I twatted her one and it was lights out.
Guy 1: Look a bunch of emos!
Guy 2: Let's start twatting them!
For any individual, male or female, heterosexual or otherwise, to engage in excessively flagrant dramatic and /or manipulative behaviour in a shameless attempt to draw attention to themselves or otherwise "ascend" the social hierarchy through stubborn and misguided insistance, thereby becoming a general nuisance to those around them.
"Oh, you know Jon. He's twatting, AS USUAL."
*sigh* "What a drama queen."
"Oh, I know...."
Paul: Well, they were twatting for months!