1. n; One who feels as if him or herself is going insane due to the lack of exposure to vagina.
2. n; Someone who is addicted to vagina-licking.
"Gloria is such a mad twatter. I've never in my life seen a lesbian who couldn't go one minute without tasting a fur burger!"
by The_Guy_who_was_lost_in_the_mists_of_evermore December 13, 2005
A girl who craves to give it up very easily, very often slightly psychotic.
"Did you see Jess in the club the other night with those guys?? She used to be such a nice girl, but now she's a mad twatter."
by Tall Slut May 04, 2006