12 CM is a penis size some people think is average or big enough but other people think it is small, most people use it in jokes which depend heavily on the context. They typically rely a lot on context because sometimes the size around 12 Cm is presented as big but other times as small.
"What a big skyscraper.. It must be 12 Cm!" "This song lasts so little, it's about 12 Cm!"
Acronym for "Change My Mind." The term's mainstream usage stems from a popularmeme format, derived from editing text onto a photograph of alt-right radio personality Steven Crowder seated behind a sign that reads "Male Privilege is a Myth / Change My Mind."
See also: CMV
Ratatouille would beat Stuart Little's ass in a fight, CMM.