The anger someone feels when that person agrees to do something they do not want to do with someone they dislike, because they feel like they have to.
Someone truley feels the snanger after he realises what he has done and really wishes he'd kept his fat mouth shut.
Snangry Person: Why the fuck did I invite my boss to the football? I fucking hate him.
Other Guy: Man you gotta get that snanger in check!
Snangry Person: Shit, why did I agree to work overtime again? I just want to watch my flat-screen TV
Other Guy: I told you man, you are such a snangry person you should really go to snanger management
What you call the pairing Snape/Hermione. Common with fanfiction writers. The slicing of Snape and Granger.
She wrote a story about Hermione seducing Snape. It was one of the best Snanger stories I've ever read.