WTF, which stands for "What The F***", is a popular slang expression used to express surprise, anger, confusion, or disbelief. If you're looking for other words or expressions that capture the same kind of emotion, there are a few alternatives you could use. Depending on the context, you could say "are you kidding me?", "seriously?", "what in the world?", "you've got to be joking", or even "holy crap!" to convey a similar sentiment. While not all of these expressions are suitable for every situation, they are useful to keep in mind if you're looking for alternative ways to express frustration or disbelief.