Lately I’ve noticed on SDMBs references to posters’ “MMP”. I have no idea what that means. Urban Dictionary didn’t help. Will someone please bring me up to speed?
Monday Morning Post, as seen here. It’s a thing some people do.
I think the original author and the MMP reference itself was first given it by our dearly missed Rue deDay. He’d start a new, always entertaining one every Monday and folks would jump in and talk about, well, anything. Nowadays a different contributor can get one going each week but, as always, pretty much anything goes in them. While there is somewhat of a regular community that posts to it each week, anyone and everyone is welcome to join in.
Since the MMP is a uniquely Straight Dope thing (as far as I know), I’ve moved this thread to ATMB.
Mixed Martial Paints. Somebody was confused. 
You mean Kung Fu Feng Shui? I have a Golden Wallpaper belt in the art.
Massive Multi Player. Refers to online gaming.
MMP = Milking Many Posts. It refers to a string of cute answers that follow the actual answer to the question. 
It’s actually an upside down dWW. Now what THAT means is an exercise left for the reader.
Ԁosʇ Woɹuıuƃ Woupɐʎ, obviously.
If you were confused by MMP, you probably want to check out the Beginner’s Guide to Glossary of Terms on Straight Dope Message Boards, which includes that and others.
That thread itself is linked from the ATMB sticky FAQs - Please Read First - Rules, Guidelines, Etiquette, Technical Issues, which if you haven’t read yet you should definitely check out.
Or if you were confused by the first link in the first reply following the OP.
Derp. From the phrasing, I assumed that was a link to an example MMP, not to the glossary.