Top definition
One whos mouth is open all the time.
Look at her mouth, she has really bad slackjaw.
by Soloman Johnson November 19, 2006
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2
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
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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
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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
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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
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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
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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
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