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From the 1930's (circa). Refers to a person of questionable intelligence. The size of the brain being given relative size of a human knuckle. Similar to pinhead.
That guy just sat on a bench with wet paint. What a knucklehead.
by The Phat Doctor December 27, 2004
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May 22 Word of the Day
A moment that is generally agreed to have had a significant influence on pop culture and everyday life. While the term was coined by Rose McGowan in context of the #MeToo movement, and is mostly associated with the K-pop community, the phenomenon is universal and a basic component of how culture works.

Real world events such as social/political movements, the election of a new U.S. President, major catastrophes and disasters, as well as entertainment such as movies, music and TV, can all function as cultural resets. Notable cultural resets in relatively recent memory include:

* The Beatles appearing on the Ed Sullivan show in 1964
* The Watergate scandal of 1974
* The release of Nevermind by Nirvana in 1991
* The September 11, 2001 attacks
* The election and inauguration of Barack Obama in 2009
* The COVID-19 pandemic
"The Nineties politically started with the fall of the Berlin Wall on November 9, 1989 and the Soviet Union dissolving on December 26, 1991, and ended with both the 2000 Presidential election which saw the victory of George W. Bush and the terrorist attacks on September 11, 2001 which left people so stupefied that it functioned as something of a cultural reset button." - TV Tropes' article on the 1990s
by Spike from Degrassi February 09, 2021
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2
A dunce. A dummy. A very stubborn person or animal.
I told him how to do it, but he would not listen, the knucklehead!
by Merrily McCarthy July 17, 2003
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3
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 June 22, 2005
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4
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 September 14, 2003
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6
Engine produced by the Harley Davidson Motorcycle Company from(1936 to 1947). The engine consists of an overhead-valve v-twin design with covers on the valves that resembled knuckles, hence the name of "knucklehead".
Mike's knucklehead got repo'd after he missed his second payment
by The B-rad October 13, 2006
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