The story
From a December 2021 post by Tumblr user thelustiestargonianmaid remarking on reblogs that recontextualize posts by associating them with fictional characters: "Bitches will be like 'prev tags omg' on my post and I check the preg^([sic – meaning prev]) tags and it's like ‘blorbo from my shows.'"
Etymology from Wiktionary, CC BY-SA 4.0.