particle
Listing particle used in the pattern ~だの~だの to give non-exhaustive examples, often with a critical or dismissive tone. Similar to ~とか~とか but more casual and sometimes negative.
彼はお金がないだの、時間がないだのと言い訳ばかりしている。
He keeps making excuses like he has no money, he has no time, and so on.
あの店は高いだの、まずいだのと悪口を言われている。
That restaurant gets badmouthed as being expensive, tasting bad, and whatnot.