An abbreviation for the discount store chain Don Quijote (often called Donki), known for low-priced goods and many 24-hour branches.
急に必要になったので近くのドンキに買いに行った。
I needed it urgently, so I went to the nearby Donki to buy it.
ドンキは夜遅くでも買い物できるから便利だ。
Donki is convenient because you can shop there late at night.
旅行のお土産はドンキで揃えた。
I got all the souvenirs for the trip at Donki.