Prat:
Noun 1. prat - the fleshy part of the human body that you sit onprat - the fleshy part of the human body that you sit on; "he deserves a good kick in the butt"; "are you going to sit on your fanny and do nothing?"
Slang an incompetent or ineffectual person: often used as a term of abuse
[probably special use of C16 prat buttocks, of unknown origin]
Printed copy · Anthology Volume 7, page 844Printed copy from The Tender For Law Anthology, Volume 7, page 844 (printed 13 June 2014). Added by this site; not part of the Facebook export.