sissorception 

the lesbian version of a "cock block"

I was about to hook up with that girl and my friend made a sissorception before I could.

sissorception by lesbian13 February 15, 2014

Scissorception 

The lesbian version of cockblock is called a scissorception. One who performs the cockblock is the scissorceptor.

"If it's two girls it's not a cockblock it's a scissorception."

Scissorception by valentina k November 4, 2013