Mabs are a "pre Moob" condition, or pre man boobs. Mabs are the flabby breast tissue flesh just before the transition to moobs.
Some men have fatty breast tissue. Although more common to men who are a tad overweight, Mabs or Moobs can happen to any man, even slender and physically fit men.
Jeff was running and his mabs were jiggling.
Whenever George wears just a T Shirt, it is very apparent that he has mabs.
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