A woman who has a very innocent demeanour or reputation but is actually very sexually wild.
She was so cute and innocent but when we got back to her place, she showed me what the true meaning of fetish is. She’s an absolute fun nun.

She comes off very shy but I think she’s actually a fun nun.
by Nicelikeiceguy February 6, 2019
Get the Fun Nun mug.
Someone who is a killjoy. Sucks the fun out of people and or moments. Ruins a joke.
Boy everytime I am around her she ruins the mood by being a real Fun Nun!
by Samtonio Boyderas January 10, 2014
Get the Fun Nun mug.