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1.
The female version of cock blocking, where a female try's to hook up with a man, but has her chances blown by a friend, who usually is fuck-face.
Female 1: OMG! NANCY! That bitch Susie totally twat swatted me when I was trying to talk to this amazing guy last night!

Female 2: What a twat swatting cunt! Lets get our nails done!

Female 1: OK!
by LilMissKrissyX3 June 29, 2009
 
2.
When a female maliciously prevents another female from getting it on with a guy she is interested in to have him for herself.
Did you see what Amanda did? She totally Twat Swatted Kristin so she couldn't hook up with him!
by K10 the Beaver July 21, 2009