The phrase comes from everyday Spanish slang, where la sabías means you knew it and hdp is short for hijo de puta, a strong insult used here for comic anger rather than a real threat. As a short isolated voice clip it spread through Spanish speaking meme pages, group chats and short video edits, where the lack of context makes it reusable. Editors keep returning to it because one shouted line can express shock, betrayal and accusation at once, fitting gaming betrayals, telenovela style reveals and everyday friend group call outs.