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1.
North American term for an extemely ignorant, possible inbred person. Usually of rural heritage.

see also: hick, mouthbreather, yokel
"Some folks will never eat a skunk, but then again some folks'll - like Cletus the slackjawed yokel."

--The Simpsons
by fortuga November 12, 2004
 
2.
One whos mouth is open all the time.
Look at her mouth, she has really bad slackjaw.
by Soloman Johnson November 19, 2006
 
3.
Dropping the mouth open and leaving it open for a time period in astonishment or amazement.
When I got the bill for the $5000.00 she put on my card for clothes at Nordstrom, I was slack jawed.
by Silicon Valley Slim May 20, 2009
 
4.
An individual with loss for words, staring blankly with mouth open. Often clueless and/or confused.

Also used as two words: "slack jaw", "slack-jaw"

"When asked to calculate the tax, she stood there slackjawed."

"The slack-jawed prophet said nothing when asked about the future of man, thus answering the question with clarity"

"The Slack Jaw Prophets rocked the house"
by MonteryJack August 06, 2007
 
5.
A game in which two people try to keep their mouths slack for as long as possible. The person who smiles or closes their mouth first loses. Like a staring contest, only with a slack jaw. Best if done in really boring classes, across the room from each other.
Jane and I had the best game of slackjaw today! It went on for fifteen minutes, but then the teacher called on me and I had to stop.
by brownbanana October 10, 2005
 
6.
The word used to describe a red-neck due to his slack pronunciation of words.
"That there whhhite water is were the trout are." "huckle bury houwd"
by two-piece August 23, 2003
 
7.
Slackjaw is a game in which two parties agree to lower their jaw in a battle of wills. The first participant to smile or otherwise move their jaw forfeits the game.
Bro, I can't beat you at slackjaw when you execute the perfect head turn and wink combo.
by Westinator2000 October 12, 2011