An onomatopoeia imitating gunshots or explosive sounds — used to represent firing or bangs.
裏の工事現場からドンパチという音が聞こえた。
I heard bang-bang sounds coming from the construction site behind (the house).
子どもたちが玩具の銃でドンパチ遊びをしている。
The kids are playing 'bang-bang' with toy guns.
A colloquial term for an exchange of gunfire, a shootout, or more generally a conflict/skirmish.
あの地域では夜中にドンパチが絶えないらしい。
It seems there are constant shootouts in that area at night.
デモが暴徒化してドンパチになった。
The demonstration turned violent and turned into clashes/shootings.
ふたりはついにドンパチを始めてしまった。
The two finally started fighting it out.