Hi, Katie! Welcome to the boards!
There used to be at least one website that listed a bunch of acronyms, but that link doesn't seem to be valid anymore. Let me tell you the two most common ones, and I'm sure that others will chime in with more...
WHAM = Wistful, Heartwrenching, Agonizing Moment
WAFF = Warm And Fuzzy Feeling - so a story is often referred to as WAFFY. There was actually an interesting discussion a while ago as to the correct pronunciation of the word...
Kathy