Definition of chuggers:
(n) :
One who chugs a drink, especially an alcoholic drink.
(n) :
A vehicle, train or boat with an engine that makes a chugging noise when running.
(n) :
(rail transport, colloquial) A heavy-duty locomotive whether electric, diesel, hybrid or steam-powered
(n) :
(informal, derogatory) An aggressive or invasive street fundraiser, especially a private contractor working on behalf of a charity.
(n) :
(fishing) A type of fish lure or fly that makes a popping or chugging sound when twitched.