Absolute Mem does have a good starting point, but so does
2004 Leaf Certified Materials Fabric of the Game Autograph Jersey Year M's Jsy
Because Rickey is featured with 5 or so different teams in the set, Beckett was kind enough to put the team in there (on lots of different sets). Why does it say Jersey and Jsy? Well, that's a great mystery.
Anyway, LCMFotG is a good set to look at for this thread.
Leaf Exhibits 1947-66 Made by Donruss-Playoff Signature Second Edition ... another good set with long names. Good call lprimus!
I know we're not counting names, but how about this one?
2004 Playoff Honors Quad Material Combo Lou Brock Bat-Jsy- Rickey Bat-Jsy-Stan Musial Bat-Jsy-Tony Gwynn Bat Jsy
Beckett put their names, but also a "bat jsy" for each of them. If you discount the names it leaves 13 words!
Playoff Prime Cuts II MLB Icons Material Combo Prime Padres Jsy-Pants
If only they hadn't been so lazy and just spelled out "Major League Baseball". Work with me here!
Here is my big pick, a little something from my personal collection (I got all of those above from my wantlist)...
2005 Playoff Absolute Memorabilia Tool of the Trade Swatch Six Prime Red Mets Bat-Hat-Jacket-Jersey-Pants-Shoes 54 #1/1
and since nobody else seems to be counting things like teams and materials like that, this one might be the longest I have that fits within those guidelines...
2005 Playoff Absolute Memorabilia Tool of the Trade Auto Swatch Single Jumbo Prime Black Mets Jsy 54 #1/1