from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Slang An insignificant or contemptible person.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A disagreeable or incompetent person.
- n. A manipulated or rigged set of business accounting ledgers.
Probably alteration of moke.(American Heritage® Dictionary of the English Language, Fourth Edition)
The origin is uncertain. (Wiktionary)
Blend of manipulated and books (usually used in plural) (Wiktionary)