Clepit

British insult used primarily as a replacement for idiot or mongoloid. The pinnacle of mediocre insults.

“Stop being such a clepit”
“I just used my phone as a torch to find my phone, I’m such a clepit”

Hefto

Word to describe the large mass of a person or an object

“You see that lass, she’s a hefto unit”

“That is a hefto spliff you’ve got there”