(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?!
Tiller is a real duck fucker
My name is Tiller, I fuck ducks and sometimes small reptiles if i am feeling frisky
Tiller, stop fucking the birds and reptiles
What Disco Stu said he should have done after steroid-crazed Marge broke a jukebox over his head at Moe's Tavern.
Disco Stu shoulda Disco Ducked
An Australian expression - if you think something is awesome, brilliant etc. then it is said to be the duck's guts.
Synonyms (see below) include the bee's knees, the cat's pyjamas, or, strangely enough, the cat's arse.
My new cricket bat is the duck's guts.
Look at that pony-tailed wanker in his BMW. He thinks he's the ducks guts.
Similar to "bee's knees" - the best (most awesome, most choice, most advanced) of all.
I love your potato salad - it's the duck's nuts.
The BMW 1 Series M Coupe is the duck's nuts.
The award given to soldiers returning home from combat during WWII.
A Lame band from North New Jersey
When the older Vets saw what the lame band was doing with their Ruptured Duck they through them off the stage.
When you sucessfully convince a person you met online to fly, at her expence, to see you for a booty call.
He is "the man", there he goes Pulling a Duck again.