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An area of south Belfast in which there is a facility for the mentally ill. Often used as an derogatory term to suggest that someone or something is mentally retarded.
Yeo, Purdysburn!

Where are you from? Purdysburn?

That's Purdysburn mate.

Hey you dropped this (bus ticket with "PURDSYBURN" crudely written on it).
by purdysburn2k7 March 01, 2010