Top Definition
RDN was voiced by Bill Maher on Real Time (5/21/10). Synonymous with PDN (see PDN - Proctologically Derived Number; previously posted to Urban Dictionary); numbers, statistics, budgets, etc. derived from and consisting solely of voluminous fecal accumulation, frequently embellished with politics.
The Catholic Church's tally of child sexual abuse cases committed by its clergy is a constipated RDN (Rectally Derived Statistics).
by hydrogeo May 21, 2010

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