#to snap

If this is okay... with which preposition it goes? at? to? Argh.  Browsing the net gave me a sense of someone breaking someone’s neck. But there were other usages that looked to me as if it meant this gesture of surprise one can do when you hear something that surprises you deeply, and you immediately see the person who said it, usually with wide open eyes, and a tense silence until your reaction is manifested. But again... it’s hard to see the slang from the standard use of certain words when you are not native.