Bigly is a real word, though archaic. It's mostly accepted that Trump was saying "big league" in a similarly... poetic... style, accompanied by am accent. Sourc

Bigly is a real word, though archaic. It's mostly accepted that Trump was saying "big league" in a similarly... poetic... style, accompanied by am accent. Source: https://www.dictionary.com/e/slang/bigly/ https://www.dictionary.com/e/slang/bigly/