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A sideberry is an extra Blackberry that one carries with oneself for work or BBM purposes. It is not as cool as other phones such as iPhone or Nexus S but is still needed for its unique functions.
Yo Simz, I just BBM'd you on my Sideberry get back to me when you have a minute my borther.

You are not an original gangster unless you have a Sideberry
by BBQ/Deeznuts December 07, 2010
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