It is the magic armatar that pops up if you have lost enough points to go from the current armatar step you were on and down to a lower step, thus no longer having unlocked the armatar you were using. It was a form for acknowledgement to the poor sods like me who had never changed their armatar after the original blank armatar got removed, but sadly that thumb up didn't last long. So now they are awarding people for losing points instead.
It could also possibly be due to a glitch, but usually it then corrects itself after a few minutes to half an hour, so I will just assume you had the privilege of being awarded for having posts or comments deleted.
Uhm... You get a post or a comment deleted. Any interaction you make on this site will, if deleted, remove the points you gained from doing it. That is why getting stuff deleted is a little bit of a punishment in itself, why mods bothers to remove stuff and why complaining about losing points pretty much points out you can't read the rules.
I can't say what might be going on here, it might just be that one of his friends deleted a bunch of his comments from their profile, but either way, it has been coursed by interaction with the site being removed. Or a glitch, but as mentioned, it is usually temporary.
