"Break you" or "Breaks you" is used to discribe something that scared you in such a sense that you "broke". Can also be used as "Break him, breaks him, breaks me."
Sort of like the sayings "That killed my soul","Killed me inside.","I just died inside."
A massively fat person: *starts humping a small child*
Witness: Uhu...Uh.. That's one of those things that will break you.
Jessica: Man! PDR class with that creepy old man will break you over and over again!