Top definition
When a man slathers a common cleaning product upon his dong and inserts it into his partner's anal cavity, working it in and out until it has been cleaned to his liking.
Jill is ready for a night on the town now that her boyfriend gave her the fanny nanny of a lifetime.
by Jaque Caque December 13, 2009
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2
A fanny nanny is someone who carries around a fanny pack. The "nanny" part refers to when for instance a group goes on a rollercoaster and needs a place to put their phones they ask the friend with the fanny pack to carry their phones.
Elena: Hey, Victoria could I put my phone in your fanny pack during the ride?
Adrian: Yeah me too!
Lacey: Me as well!
Sarah: if you don't mind...
Victoria: *sigh* I guess I'm the fanny nanny today.
by The Fanny Nanny July 10, 2013
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