Definition of "spam"

spam

/ˈspæm/

noun
countable and uncountable, plural spams
1. (uncountable, rarely countable, computing, Internet) Unsolicited bulk electronic messages.
  Quotations
  In America alone, people spent $170 billion on “direct marketing”—junk mail of both the physical and electronic varieties—last year. Yet of those who received unsolicited adverts through the post, only 3% bought anything as a result. If the bumf arrived electronically, the take-up rate was 0.1%. And for online adverts the “conversion” into sales was a minuscule 0.01%. That means about $165 billion was spent not on drumming up business, but on annoying people, creating landfill and cluttering spam filters.
  2013 May 25, “No hiding place”, in The Economist‎, volume 407, number 8837, page 74
2. (uncountable, computing, Internet) Any undesired electronic content automatically generated for commercial purposes.
  Quotations
  An Act to provide for the control of spam, which is unsolicited commercial communications sent in bulk by electronic mail or by text or multi-media messaging to mobile telephone numbers, and to provide for matters connected therewith.
  Long title, Spam Control Act (Cap. 311A, R. Ed. 2008)
3. (slang, Internet) Excessive, often unwanted and repeated online messages.
4. (slang, Internet) Ellipsis of spam account.
5. A type of tinned meat made mainly from ham.
verb
third-person singular simple present spams, present participle spamming, simple past and past participle spammed
1. (intransitive, computing, Internet) To send spam (i.e. unsolicited electronic messages.)
2. (transitive, computing, Internet) To send spam (i.e. unsolicited electronic messages) to a person or entity.
3. (transitive, intransitive, computing, Internet) To send messages repeatedly, often with disruptive effect; to flood.
4. (transitive, by extension, computing, video games) To do something rapidly and repeatedly.