That last one is probably the source, it got reposted to something awful around that time and that's where I grabbed it.
It was in a thread where people would discuss various something awful things, specifically the fact there was a lot of posters in those threads who didn't do anything but talk about something awful. I've used it as a mascot for every meta forum I've made since. I cut my posting teeth in shitredditsays, a community of people who only posted on reddit to talk about reddit, and I never wanted that to happen again.
twovests wrote (edited )
I found a post by FacebookAunt on SomethingAwful dated November 22nd, 2020: https://forums.somethingawful.com/showthread.php?threadid=3863200&pagenumber=907
I can also find a reference from January 2015 in the r/meta_me_irl descriptioon: https://web.archive.org/web/20150312162214/https://www.reddit.com/r/meta_me_irl/
Note that it's "mosts". That is, "mosts of my posts are posts about posting". I'm suspecting this is from SomethingAwful...
But even further back... I find an AdviceAnimals from 2013 by.... u/SUPERCUB?? Named after the mid-00s aviation enthusiasts webforum??
This might run deep. I'll report back with the deets if I can find them.
EDIT: it doesn't run any deeper. 2013 babey