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1) A Phrase Someone Might Say When They Are Surprized. The Person Might Be High, Drunk, Or Mentally Unstable (Insane) Or A Combination Of The Three.

2) Two Ducks From Heaven Having Sex. Need I say More?
You Die And Go To Heaven And See Two Ducks Having Sex.

You Might Say "HOLY DUCK FUCK!?"
by thatawesomeguywithweirdmum September 08, 2010
Used when seeing something so unbelievingly mind blowing your brain has a spasm in an attempt to keep your head from exploding.
~You walk outside and see two hot, half-naked lesbians making out on your front porch~

You: "Holy Duck Fuck..."
by ThatEducatedBlackGuy November 17, 2010