What is a fuckboy ? I don’t understand this sentence ....
I watched a video in which they talked about a fuckboy ( I know what it means ) but I don’t understand the way they explained it .

A fuckboy is a guy who leaves you unread , ghosts you and is probably online at Supreme.

I don’t understand the last part “ is probably online at Supreme.”
What’s this supposed to mean ? Is there anyone who understands it and could you explain to me a bit ?

Thanks a lot .

Question

What is a fuckboy ? I don’t understand this sentence ....
I watched a video in which they talked about a fuckboy ( I know what it means ) but I don’t understand the way they explained it .

A fuckboy is a guy who leaves you unread , ghosts you and is probably online at Supreme.

I don’t understand the last part “ is probably online at Supreme.” 
What’s this supposed to mean ? Is there anyone who understands it and could you explain to me a bit ?

Thanks a lot .

Answer

'Supreme' is an expensive US skateboarding and clothing brand, worn by some male adolescents to attempt to signal status. However, the brand is not looked upon favorably by many, and is seen as over-priced and low quality. Hence, the idea of him browsing an online store for clothes by Supreme indicates his clueless and transparent attempt to appear fashionable and cool.