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The act of storing items that one would put in a fanny pack up the ass of ones self and/or in some cases the ass of another (sometimes willingly, sometimes not)
Yourself:

"$7.50 for a beer?! Fuck that! I'm fanny packing one in!"

Another:

Jon: "What do you mean you lost your car keys?"

Jamie: "Me and my girlfriend were fanny packing last night and I haven't seen 'em since."
by kempen May 12, 2008
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2
The act of storing a cell phone with a google map app in your fanny pack while having sex. The app keeps track of speed, distance and duration for you.
I was fanny packing this past weekend and it was fantastic.
by FancyNance August 29, 2011
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