When your next to a group of Chavs and you start wanting to act like them or you start to get nauseous around them and feel suffocated by their Chavyness.
The irrational fear that onemightactually see his or her poop before flushing the toilet.
Ann has such a severe case of crapaphobia that she once fell down and broke her arm in the bathroom while trying to frantically reach for the flusher handle.