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1.
(1) Used as a safe substitute for what the fuck in most contexts.
(2) Used to convey a special uniqueness and/or creativity in cursing.
Your little brother takes your gold:
What the duck do you think you're doing with my gold?

Your 'friend' leaves for a lunch break while you're in the deepest part of the dungeon:
Dude, you totally left me to get pwned all alone! I mean, what the duck?!

A friend makes a decision that suxx0rz:
What the duck is the matter with you?!
by Jonathan Barnett October 01, 2006