The phrase comes from Russian online culture, where Eldorado is widely known as a major electronics retailer associated with sales and prize promotions. Clips built around its gift announcements spread on soundboards and in short videos, detached from any specific advert and reused as a standalone reaction. Russian-speaking creators keep using it because the wording is instantly recognisable and flexible: it can introduce a present, a delivery or a lucky win, even when the item shown is deliberately unimpressive, which keeps the joke working across new edits.