'm /əm/verb 2noun 1 verb2 •a short form of "am", used after "I"What'm I gon' do? •(dialect) Various forms of be.You'm no better than a baby when they've clacketed at ye for an hour or two without a word of sense from beginnin' to end. — 1874 noun1 •Represents the word madam or ma'am when used as a formal address of a female; as in yes'm and no'm.