[quote=@MiddleEarthRoze]
[@ArenaSnow]

You'll be thinking of a Nephilim, which is half angel, half human.
[/quote]

Ah, that is what it was.

Then I haven't seen a single demon/angel mix reference in SPN... so it probably isn't a thing at all.

I don't think they actually can mate to make a mixture, anyways. At least from my understanding of their natures.