"Sorry, I was reminded of an internet meme that uses 'cheese pizza' as a code phrase for 'child porn' because I noticed your 8 year old daughter has an ass I'd like to curl up with on a cloudy day."
Only way your gonna get it is if someone was in that thread and saved the picture or if someone just HAS the picture somehow.
Because I snooped around best I could and nothin, **** all, no one has ever given souce wherever it was posted.
If you really want that photo you can go to /b/ share that image and hope to one coming with sauce, that's all I can say. I've done the same and usually it works, those people are really fast with sauce