"matthew" is usually referring to male characters who's main characteristics are: queer, very proper and clean, have short brond hair, are drama queens, sometimes mean, like social media and are single.
ofcourse not all matthews are male nor they need to have all these characteristics.
the name is inspired by Matthew MacDell from the Netflix show: Big Mouth
"to be honest lou from uglydolls is giving me major matthew vibes"
"you are right! he is such a matthew"