It’s a meme from an old episode of Arrested Development. You’ve seen it here on tumblr, but not always with the original context.
The character sees a paper bag in the fridge labelled “Dead Dove Do Not Eat.” He takes the bag out of the fridge, opens it up, makes a disgusted face, and then the famous “I don’t know what I expected.”
When you see a fic tagged with “dead dove do not eat” it basically means, “this fic is clearly labelled (tagged) indicating content that some people will not want to read. If you read it anyway, it’s your own fault. I warned you.”
It can also be interpreted as “See those tags and warnings? I’m not joking around. Pay attention to them.”
I am Silver Tongue, I am an artist. I have many characters and you can check out my art in the art tag. I occasionally practice witchcraft though I don't do anything too complicated. I am girl 2 and don't know what else to put here.