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1.
Southern term referring to an object or person that is out of sorts.
I got out of the car and the wind was blowing so excessively that my hair got all whomperjawed.
by Jay Stevens January 25, 2006
 
2.
A term denoting a messed up situation, place, or thing.
John's car was whomper-jawed after the car wreck.

Susan's face was all whomper-jawed after the softball hit her.
by Steve November 12, 2004