a mythical creature who magically puts condoms under one's pillow in the event that one gets "lucky" with someone but forgets to bring a condom.
girl: do you have a condom?
guy: i didnt bring one.
girl: check under your pillow.
guy: dude where did this come from.
condom fairy: FROM ME, THE MIGHTY CONDOM FAIRY!
When you pick up a chic at a bar, bring her home, bang her and then put the used condom under your roommates pillow.
After I was done with that bitch last night, Jim got a visit from the Jersey Shore Condom Fairy.
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