An initialism for "What the fuck?" in internet slang. Other, less frequently used meanings include: "Who/Where/Why the fuck?". It has been said that this meaning is sometimes used in military parlance, expressed in the NATO phonetic alphabet as "Whiskey Tango Foxtrot".
This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. If an article link referred you here, you might want to go back and fix it to point directly to the intended page.