When an individual is so exhausted that their cognitive skills are compromised, effectively lowering their IQ
Jules was so fatigued after the long hours of driving that she could not remember whether to put out the recycling, the garbage, or the cat. Swaying with exhaustion she exclaimed, "I put the milk in the closet and the detergent in the fridge just now. I am officially dumbass tired!"
by Jules.Sheehy July 13, 2016
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