The two gay guys he is showing his "magic" to repeatedly say this after he does something crazy. Used to describe something ridiculous or incomprehensible. Or as a random outburst, fake expletive or exclamation.
1st guy: Yes I'm sure I didn't...
Both: What the eff? What the EFF!!
Gay Guy 1: Orange Soda Big Whoop.Big Whoop.
David Blane:Look again.
Gay Guy 1:WHAT THE EFF?! CHEEZ ITS?!
(David Blane looks in the camera crazily)
Gay Guy 1: Where'd you put my Orange Soda David Blane?
(Gay guy 2 spits out Orange soda)
Gay Guy 2: STOP PUTTING ORANGE SODA IN MY MOUTH DAVID BLANE!!!
OMG, thats awesome. I'm going to buy a mansion now and a tight car.
Oh too bad, so did three million others, so you got one dollar.
What the eff!