Jonbouy
The origin is one thing it's current meaning is another.
(UK, mildly pejorative, slang) a stupid or annoying person; simpleton; fool.
...or in this context, the Bapu.
HTH
One of the nice things about language is that it evolves, perhaps this derivation, as highlight by our own luminary Sir Jon of Bouy, should be submitted to the OED for the next edition.
Steve I think you surmised correctly
