>>7
Stems from the tall tales that developed when logging was much more prevalent in North America. Apparently, when Paul Bunyan took a dump, his shits were so big, they had to be hacked to small pieces before they could be buried. The chopping had to be done promptly, or else the shit would harden. So, Bunyan allegedly shouted, "HAX MY ANUS," before laying an egg so that the other lumberjacks could take care of it. That's why the phrase has nowadays become associated with shitposting.