Woah, this escalated quickly, but then that's the norm for many things discussed on Perb lol
In my world, to my understanding, "Simp" is rarely used with ill intentions to attack a good man. This is more of a term to describe guys who are nice, respectful and maybe sometimes go the extra mile to impress the girl he is into at his own expense. In such case, this guy might be called "Simp" by his guy friends, but it is not really harmful to the guy's reputation among women. As far as I know, women wouldn't avoid guys that are labeled as a simp.
Since you are looking for the definition of simp, let me take another popular word for better explanation: "Fuck boy". I assume everyone understands what qualifies as a fuck boy and their behaviour, and simp is the exact opposite of a fuck boy in his behaviour and his attitude toward women. As far as I know, among guys, fuck boys are the ones who are being celebrated. So, simps, on the other hand, are being mocked or teased by guys, but it is not seriously harmful for the guy. I doubt anyone would take serious offense if he is called a simp.
Maybe because we have people of all demographics here so the tone of the conversation often escalates quickly, but damn y'all gotta chill. Looking at all the analysis like incel culture... Idelizing mediocre pussy... WTF LOL simp is another word for "Mr Nice Guy" that's it. Why we gotta escalate it like that 😅