"mabs" is an acronym for Mid Afternoon Butt Sweats. The mabs is that moist, slightly unpleasant feeling in your underwear on a warm day or after some physical activity.
"mabs" is frequently preceeded by "the" ("the mabs").
That briskwalk gave me the mabs.
I know it's still morning, but I've got the mabs.
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.