I didn't think it had anything to do with what you just said. I remember it being a meme that started on Reddit as a way of calling someone a rightwing person who is making stuff up. Both "post hog" and "hogout or logout".

The founding incident happened when users baited a rightwing user by demanding they post pictures of their penis as evidence in a 'pics or it didn't happen' situation. With the chapo subreddit and so many other left-wing subreddits now removed from Reddit, sadly I can't find the original thread anymore.