1.The act of humping while while your legs are asleep, numb, or dead. It releases a shivering sensation down the legs.
2.The act of a human or animal squatting out of pain to use the bathroom at a bad time.
1. "Oh Bob, looks like the Gerbert had a little too much to drink, he is lumping the stool again."
2. Out of excruciating pain and prevalence, the man was left lumping in the bathroom line.
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