Top Definition
The red spot that one gets, usually on the legs, when putting prolonged pressure on the skin via another limb; commonly confused with a sunburn, from where the term is derived, or a rash.
After Loretta spent all night studying, she noticed that her elbow, which had been resting on her thigh, had given her a Sundberg the size of an orange.
by dpinzon July 14, 2013
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