When you eat a girl out when she's on her period. As if your a vampire like in the movie twilight.
I went down on my girl and to my surprise I got some twilight twat.
by williamthomas13 February 11, 2012
A teenage girl who obviously is a fan of Twilight.
"Man, check out all that Twilight Twat!"
by CDlustscats February 14, 2010