Dick swab

Interchangeable with fuckwit but additionally despise as being incompetent or utterly useless

Reckons he’s a genius but he’s an absolute dick swab

Kraken

A kraken is a karen on crack.
It’s much more horrible and loud than your normal karen and it could be very dangerous if you get to close to her.

Girl: be ware theres a kraken!
Boy: where?
Kraken: jakalsijslL