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!