It's a slang term often used in online communication like texting or social media. The multiple "f"s amplify the emotion and emphasize the speaker's feeling of being overwhelmed.
It's important to remember that this phrase is very informal and can be considered rude or offensive in some contexts.
Here are some situations where you might see it used:
* Someone shares shocking news: "My cat just learned to speak French! Wtfffffffffff!"
* You witness something bizarre: "I just saw a squirrel riding a bike! Wtfffffffffff!"
* You're confused by something: "What did you just say? Wtfffffffffff!"
While it's a popular way to express strong feelings online, it's best to use it sparingly and in appropriate situations.