40k means (informal, slang, science fiction) Warhammer 40,000, a British tabletop military game set in a dystopian future Galaxy torn by war.. It's mostly used in British informal speech. It's casual and generally safe with friends and online. It's standard online vocabulary; nothing inherently concerning about hearing it.
40k
(informal, slang, science fiction) Warhammer 40,000, a British tabletop military game set in a dystopian future Galaxy torn by war.
Seen in the wild
Firecrawl: Warhammer 40,000 - Wikipedia
[Jump to content](https://en.wikipedia.org/wiki/Warhammer_40,000#bodyContent) From Wikipedia, the free encyclopedia Miniature wargame "40K" redirects here.
View source
Firecrawl: Warhammer 40,000 - Wikipedia
[Jump to content](https://en.wikipedia.org/wiki/Warhammer_40,000#bodyContent) From Wikipedia, the free encyclopedia Miniature wargame "40K" redirects here.
View source
Firecrawl: Warhammer 40,000: Space Marine 2 - Wikipedia
04. **[^](https://en.wikipedia.org/wiki/Warhammer_40,000:_Space_Marine_2#cite_ref-5 "Jump up")**Linwood, Timothy (12 September 2023). ["Everything revealed about Warhammer 40k Space Marine 2 combat"](https://www.warga…
View source
Firecrawl: Warhammer 40,000: Space Marine 2 - Wikipedia
04. **[^](https://en.wikipedia.org/wiki/Warhammer_40,000:_Space_Marine_2#cite_ref-5 "Jump up")**Linwood, Timothy (12 September 2023). ["Everything revealed about Warhammer 40k Space Marine 2 combat"](https://www.warga…
View source
Definitions
UK
#1·Apr 26, 2026UK
(informal, slang, science fiction) Warhammer 40,000, a British tabletop military game set in a dystopian future Galaxy torn by war.
Origin: From . From 40,000, part of "Warhammer 40,000", referring to the future year where the game was set in. Origin information sourced from Wiktionary contributors (CC BY-SA 4.0).
For parents
40k means (informal, slang, science fiction) Warhammer 40,000, a British tabletop military game set in a dystopian future Galaxy torn by war.. It's mostly used in British informal speech. It's casual and generally safe with friends and online. It's standard online vocabulary; nothing inherently concerning about hearing it.
For ESL learners
"40k" is slang. It means: (informal, slang, science fiction) Warhammer 40,000, a British tabletop military game set in a dystopian future Galaxy torn by war.. Register: casual. Use it in: casual conversation and online posts. Avoid in: formal writing and professional emails.
Cluster: gaming
Heard in the wild
“[Jump to content](https://en.wikipedia.org/wiki/Warhammer_40,000#bodyContent) From Wikipedia, the free encyclopedia Miniature wargame "40K" redirects here.”
“[Jump to content](https://en.wikipedia.org/wiki/Warhammer_40,000#bodyContent) From Wikipedia, the free encyclopedia Miniature wargame "40K" redirects here.”
“04. **[^](https://en.wikipedia.org/wiki/Warhammer_40,000:_Space_Marine_2#cite_ref-5 "Jump up")**Linwood, Timothy (12 September 2023). ["Everything revealed about Warhammer 40k Space Marine 2 combat"](https://www.wargamer.com/warhammer-40k-space-marine-2/combat). _[Wargamer](https://en.wikipedia.org/wiki/Wargamer_(website) "Wargamer (website)")_.”
“04. **[^](https://en.wikipedia.org/wiki/Warhammer_40,000:_Space_Marine_2#cite_ref-5 "Jump up")**Linwood, Timothy (12 September 2023). ["Everything revealed about Warhammer 40k Space Marine 2 combat"](https://www.wargamer.com/warhammer-40k-space-marine-2/combat). _[Wargamer](https://en.wikipedia.org/wiki/Wargamer_(website) "Wargamer (website)")_.”
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For specific readers
Why is this section here?
Slang is read by different audiences for very different reasons. The For parents view re-explains the term in plain, non-judgemental language so a caregiver can understand what their child means without needing the surrounding subculture. The For English learners view focuses on register (when it's safe to use), formal alternatives, and common mistakes — what a textbook won't teach you.
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UK
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🇬🇧About British & Irish slang slang
UK and Irish slang — Cockney, Scouse, Geordie, Yorkshire, Glaswegian, Brummie, Welsh, West Country, plus Irish English. Centuries of regional dialects feeding into modern British and Irish street talk.
See all British & Irish slang slang on Slangora.
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