I believe a "Memes" wiki could be useful to this site if it will help new users understand some of the particular references that may be found here. It might help people feel more a part of the community if there were less things the community did that they found incomprehensible.
Looking at some of the examples posted above, I'd say that as long as we stick with the standard format (Meme/Originator/Cultural Height/Background) so that actual context is provided, it would be helpful.
Not to pick on travel.se, but we should avoid the format they've used, as it seems strictly supportive of "hey, remember when this happened?", and actually makes the clique/exclusiveness division between long-standing participants and new members worse.
We do make enough references here that can be confusing to users without context that I believe it would be helpful. Some examples off the top of my head include "Is x a Time Lord?", and time traveling robots (much as I am reluctant to in any way put a positive spin on a spammer's obsession). Both of these still appear with some regularity in comments, and it would help if users have some context for stuff like this.