20m
Twenty man
Example
It's so much easier to assemble a 10m group than a 20m group
20m definition by Slang.net
This page explains what the abbreviation "20m" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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World of Warcraft (WoW) players use 20m to refer to "twenty man" raid groups. Most often, players use 20m in reference to Mythic raids, which require a 20m group.
Mythic raids are WoW's hardest raids, so 20m groups are typically comprised of very experienced players. Non-Mythic raids are more flexible, requiring either a 10m or 25m group - which may include a raiding noob or two.