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1.
When a female trys to intervien with another female who is trying to hook up with some bro. a.k.a. Girl version of cock blocking.
guy 1: " yo this girl is all on my D"

guy 2: " oh truee. get that nut!"

guy 1: " Bro, im trying but this other hoe keeps interviening, shes being such a twat swat! "

guy 2: Ohh definate Twat Swatting!
by Shaunbee/ B.D. / Dane Cook February 03, 2009
 
2.
The lesbian version of cock blocking; when someone messes with a dyke's mojo
Yo, I'm sorry about last night's twat swatting. I didn't realize you had a girl with you. I'm sorry if I interrupted anything.

This femme's ex-boyfriend just didn't know when to quit! He wouldn't leave us the hell alone! Fucking twat swatter.
by JkT October 19, 2005