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1.
An expression of surprise or confusion used when what the fuck is insufficient to convey the magnitude of the situation. The increasingly flippant use and associated devaluation of the query 'what the fuck?' has necessitated the creation a more heart-felt derivative.
"What the actual fuck are you doing?"

"Have you seen Russell's beard yet?"
"Yeah... what the actual fuck?"
by wanking_at_gunpoint August 13, 2008
 
2.
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?".
by DollyDolittle May 27, 2011