[flyboy]

Skinny definition :

(of a person or part of their body) unattractively or unusually thin. (Oxford Languages)

A skinny person is extremely thin, often in a way that you find unattractive. (Collins English Dictionary)

Slim Definition:

(of a person or their build) gracefully thin; slender. (Oxford Languages)

A slim person has an attractively thin and well-shaped body. (Collins English Dictionary)

I think what bros desire is slim. All the dictionaries I search have negative descriptions on skinny.