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1.
I would have been your daddy. A skull hidden in the Halo 3 games that, when found, reveals dialogue about the Halo campaign.
Holy crap! The skull will kill us all! It's the IWHBYD skull!
by Crabbers September 29, 2007
 
2.
I Wanna Have Babies You Down?
Monkey: IWHBYD?
Turtle: No, you're not my father.
by pewpewpewpew June 17, 2010