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1.
Pronounced "preemah doo-chay".

When you go to drop a duece in a public or work toilet and discover that you are the first to use that toilet since it was last cleaned giving you a relatively germ, detritus, and smell free experience.
"I always get to work early so I can score the prima duece before <insert stinky co-worker here> defiles HCS"
by BlancoGrande March 09, 2010