Refers to the boring/laborious --- not to mention demeaning --- every-few-months routine that a responsible and caring-about-his-public-image person needs to perform on his on-line profile-pages. Standing for Periodic Profile-Perusing/Purging, it involves occasionally going to your own profile and carefully scanning the comments/tags that others have posted there, and then deleting any posts that are either in poor taste or verbally attack your personal character.
I always try my best to treat others right, but unfortunately there are plenty of nosy/overzealous cyber-bully a**h**es out there who like to find fault and berate me for stuff that I either can't even help or certainly did not mean to be hurtful to anyone (and even if someone actually DOES think that he may have a legitimate gripe/concern, why not just SEND ME A PRIVATE MESSAGE ABOUT IT, rather than slamming me publicly?!??). So I gotta endure a round of "quadruple-p" drudgery a few times a year, just to make sure that any decent folks who read my profile don't get the wrong idea about me.
Academic, archival research in which menial drudgery take the form of slogging through (or dredging) all sorts of uninteresting stuff intending to find, say, a laundry list proving that Einstein or Michelangelo or Barbra Streisand was really a woman, but which never yields such a nugget of inspiration.
Larry failed to proved Beatrix Pottergave birth to Harry, so his afternoon of searching in the Hall of Records was pointless dredgery.