Knumpty

Like numpty but improved. The k isn’t silent it has to be pronounced. A knumpt is a very dumb person.

Kate: *breaks a flower vase*
Kuba: Kate you numpty
Kate: Actually I’m a knumpty

Kuba: What’s that
Kate: it’s a numpty but dumber
Kuba: so you really are a knumpty
Kate: :(

Kupboard

The correct way to say cupboard. Often used to describe very smart individuals.

Steve: Hey what did you get on your test?
James: I got 100%
Steve: You're very smart James
James: Would you say I'm a kupboard?
Steve: Get out of my house
James: But this is my house
Steve: Get out