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"Officer D" is short for "Officer Dickhead". Commonly used by punks, skaters, and other "fuzz haters", for a cop being an ass.

Officer D. has been seen in a few things, including the THPS serise (Tony Hawk Pro Skater), one even having a unlockable character named Officer D. The same officer can be seen in Tampa of THUG.
"Oh look, its officer D."
by Kamoku November 10, 2007