Populist means appealing to ordinary people against the elite. A populist leader, populist policies, populist rhetoric.
Political scientists use it as a description rather than an insult: a populist claim divides society into a pure people and a corrupt elite and says the leader speaks for the first. Almost nobody applies the word to themselves.
1adjectivepopulistAppealing to ordinary people against the elite.
“The populist candidate claimed to speak for forgotten workers against the bankers and bureaucrats.”
populist is a political style.
From populus + -ist.
Etymology from Wiktionary, CC BY-SA