An affectionate nickname for author Terry Pratchett, which was created on the alt.fan.pratchett newsgroup, and reflects the naming structures in the kingdom of Djelibeybi in Pyramids.
In Djelibeybi, anyone with a name starting with a 'T' had a silent 'p' in front, such as Pteppic and Ptraci. A parody of the names of certain Egyptian Pharoes.