The phrase comes from Argentine television political commentary associated with Carlos Pagni, whose serious on air delivery made short excerpts easy to clip and share out of context. Spanish speaking users began circulating lo que buscabas as a standalone reaction on soundboards and in chats, applying the line to searches, finds and recommendations far removed from politics. Its popularity rests on that mismatch between a formal journalistic tone and everyday situations, which lets a three word phrase work as both confirmation and joke without needing further explanation.