Top Definition
A variant of Mentally Retarded, this condition affects women during their period, when they are often prone to completely illogical and irrational behaviour.
"Heather must be on her rags! She's acting completely menstrually retarded."

"Did you see the way that Toby was attacked by Janine?!? Over nothing! She's acting menstrually retarded."
by Turdy Barrelnuts April 20, 2010
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