사거리 (sageori) literally means 'four-way intersection' or 'crossroads'. It's a common geographical term, but its use in this song is particularly interesting and symbolic.
BLACKPINK uses it to represent their global reach and influence, singing, "지금 내가 걸어가는 거린 사거리 동서남북 사방으로" (The street I'm walking on now is a crossroads, to the east, west, south, and north). This implies they are at a pivotal point, expanding their impact in all directions, making it a powerful metaphor for their worldwide success and the choices they make.
BLACKPINK's "DDU-DU DDU-DU" is a massive anthem all about confidence and power. The whole song is built on the group's name: the contrast between being pretty ("Pink") and being fierce ("Black"). They state this directly in the lyrics: "Black 하면 Pink 우린 예쁘장한 Savage" (When you say Black, we say Pink, we're pretty savages). They warn you not to be fooled by their looks, saying they have a "착한 얼굴에 그렇지 못한 태도" (A pretty face but an attitude that's not). They aren't going to pretend to be nice just to please people.
The song is full of bold claims about their success and control. They say they're like a "물 만난 물고기" (a fish that's found water), meaning they're in their element and unstoppable. They even brag that your whole bucket list is something they've already bought! The title itself, "뚜두뚜두 두" (DDU-DU DDU-DU), is meant to sound like gunshots, which is their way of saying their impact is powerful and direct. It's a warning: if you wanted someone easy to deal with, you came to the wrong place.