Take a standard "What the fuck?", multiply by a level of disbelief or incredulity, and then you have "What the ACTUAL fuck?".
Someone parks in two spaces, you exclaim "What the ACTUAL fuck?",
Someone gets up in your face, you shout "What the ACTUAL fuck?".
邮件由 email@example.com 发出。我们决不会发送垃圾邮件。