from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a stupid or annoying person; simpleton; fool.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a person who is not very bright
The origin of pillock is believed to go back to the 16th century meaning penis from the Norwegian word pillicock, presumably akin to the slang dickhead meaning inept fool. (Wiktionary)