when you shit on someone's Ipod, Iphone, or I-anything.
Not to be confused with a BlackberryDecker.
That iPhone was just sitting there on the table, so rather than steal it, since I hate AT&T, I left an idecker for everyone to share. I would never leave a BlackberryDecker, or even a droidDecker, but leave your icrap unattended, and idecker.
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