Please tell me the meaning of ((feeling flatter than a fritter)) in this paragraph:
It is different every day. My whole day’s plans might go out the window because a teacher’s lesson plans change. Someone might snag me in the hall and open up a new opportunity for me. I love that part. I always go in wondering what will happen. I’m always challenged and surprised. And just like teaching, some days I expect trouble, and things work out beautifully; other days I expect smooth sailing, and I end up feeling flatter than a fritter.