The Female equivalent of a cock block. When a female does something that prevents another female from having sex.
Alyssa: "Wow Jilian is such a Vag Snag, she stole the drink that guy sent me."
A person, who upon arrival, causes your things to spontaneously stop working or break.
Guy 1: "Dude, as soon as Steve came over my internet stopped working, my xbox got the red-rings of death, my laptop crashed, and he broke my glass of water!"
Guy 2 : "Yeah, Steve is definatly a Brymon."