dirt cheap adjective 1adverb 1forms 4 adjective1 •(informal) Very cheap; easily affordable.Plus there were so many people wanting to move to the countryside that the little places which were dirt cheap suddenly became not dirt cheap. — 2023 adverb1 •(informal) Very cheaply; at an easily affordable price.Dirty deeds and they're done dirt cheap. — 1976 formsmore dirt cheap · more dirt-cheap · most dirt cheap · most dirt-cheap