Often used in discussions about fitness, health, or appearance; can carry connotations related to body positivity or negativity. He hit the gym to lose the flab he'd gained over the holidays.
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Informal
While common in conversation, 'flab' is informal and might be inappropriate in formal writing or speaking contexts. I've been jogging to shake off this extra flab.
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Descriptive Imagery
The term paints a vivid picture of excess weight and can sometimes feel less clinical or harsh than 'obesity'. She smiled, unconcerned about the bit of flab on her arms.