Noun
chugger (plural chuggers)
(informal, derogatory) An aggressive or invasive street fundraiser, especially a private contractor working on behalf of a charity.
One who chugs a drink, especially an alcoholic drink.
(fishing) A type of fish lure or fly that makes a popping or chugging sound when twitched.
A vehicle, train or boat with an engine that makes a chugging noise when running.
Source: en.wiktionary.org