"What the fuck?"
Based on the police (and military) call sign alphabet where "Whisky" is "W", "Tango" is "T", and "Foxtrot" is "F". For use in situations where swearing would be unwise, such as at work or around minors.
To be used only as an interjection.
It got up to 80 degrees in October! Whisky Tango Foxtrot?!