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Webster 1913 Edition

(pĭg′pĕnˊ)

Noun.

A pen, or sty, for pigs.

pigpen ‎(plural pigpens)

A pigsty; an enclosure where pigs are kept.
Something extremely dirty or messy.
This room is a pigpen. When are you going to clean it?‎
(cryptography) the pigpen cipher

pigsty — see pigsty

something extremely dirty