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1.
1. (n., plural) An administrator who puts forth minimal effort.
The minmins at Fark.com greenlighted another retarded headline.
by DongleBeans July 16, 2009
 
2.
Minmin is a friendly term used for one's vagina.

It is most commonly used by middle class English yummy mummies and their offspring.
'Amanda displayed her minmin to the hole class on Friday'

'I've got an itchy minmin'
by Fastasleep June 10, 2007