I found this on google at http://www.infoplease.com/dictionary/brewers/piries-chair.html
Pirie's Chair

"The lowest seat o' hell." "If you do not mend your ways, you will be sent to Pirie's chair, the lowest seat of hell."

    In Pirie's chair you'll sit, I say,
    The lowest seat o' hell;
    If ye do not amend your ways,
    It's there that ye must dwell.

Child's English and Scottish Ballads: The Courteous Knight.

Pirrie or pyrrie means a sudden storm at sea (Scotch pirr). "They were driven back by storme of winde and pyrries of the sea." (North: Plutarch, p. 355.)

Hope that helps,

kat