Definition of chummed:
(n) :
(dated) A friend; a pal.
(n) :
(dated) A roommate, especially in a college or university.
(v) :
(intransitive) To make friends; to socialize.
(v) :
(intransitive) To share rooms with someone; to live together.
(v) :
(transitive) To lodge (somebody) with another person or people.
(n) :
(fishing, chiefly Canada, US) A mixture of (frequently rancid) fish parts and blood, dumped into the water as groundbait to attract predator fish, such as sharks.