Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Origin: Probably from Spam

spam

1 verb
     
spam1 past tense and past participle spammed, present participle spamming [intransitive and transitive]
to send the same message to many different people using email or the Internet, usually as a way of advertising something - used to show disapproval
—spamming noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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