In fact 'hwp' is an acronym typically used as a euphemism for "overweight or obese, but not morbidly obese".
"hwp" is generally substituted for actual numbers, hiding the person's actual weight. Most people who claim to be hwp are overweight or obese, but not super extremely fat. Skinny people and thin people never claim to be hwp in personal ads, though they fit the literal definition.
"I'm never answering another craigslist ad without knowing how much the person actually weighs! No more HWP guys for me!"
"Don't call me HWP, I'm in good shape!"