Top Definition
A term used to describe a sexually frustrated, older woman.
"That's not a cougar, that's a blue nun".
by amazingme February 04, 2010
1 more definition
A brand of German wine which is considered "tacky and dated".
Alan Partridge:
"Yeah I'll Just have half a bottle of Blue Nun"
by Bwanana January 17, 2008

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