from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Minute, trivial, unnecessary, and unjustified criticism or faultfinding.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The painstaking process of removing nits (lice eggs) from someone's hair.
- n. A process of finding or pointing out tiny details or errors, particularly if the pointed-out details seem insignificant or irrelevant to all but the finder.
nit + picking (Wiktionary)