look up anything, like your first name:
1. knuckle head
Someone of limited intelligence and with a mean nature. Who prefers using their knuckles/fists, to using their head.
That doorman looks a real knuckle head
by IanM Sep 14, 2003 add a video
2. knuckle head
Someone who has just made a mistake or done something wrong. Often used in a joking manner between friends.
After arriving at the ski resort Pat discovered that he had forgot his skis to which his friends responded "Pat, you're a knuckle head!".
by zantern Jun 22, 2005 add a video
rss and gcal