If you call somebody clapped it means they're ugly. You can call a person clapped and you can also call specific things "clapped" e.g you can call a Hairstyle clapped or Someone's Hair Line.
"Yo, Look at that girl."
"What about her?"
"She's so clapped" (She's so ugly)
Very Fucking ugly. So ugly you want to clap them very hard
Jake: Yo, was that your stepsis bro?
Andrew: Yeah man she’s hot innit ?
Jake: tbh she CLAPPED