Talk:Lauren Faust/@comment-22547380-20150122111700/@comment-4531340-20150124071251

Nope, as stated above, it was just a humorous way of censoring pornographic (rule 34) images (and if you've ever seen a Subway sandwich, you'll know what they censored out in such images) involving this pony on Ponibooru, which then spread to other ponies (in a more limited role).

From there, it was incorporated into images that were never pornographic to begin with, such as File:Lauren Faust subway sandwich.png, in reference to those earlier censorship images (as a bit of a joke, really).