In South Africa a "whatchamacallit" is called a DINGUS.

We say JA (pronounced YA) instead of yes

We have a really annoying habit of saying "is it" instead of "goodness me" or "really" - which makes us sound like we don't give a hoot.....eg
You say " I just stubbed my toe and it's really sore"
My response - " Is It?"

We also say HOWZIT instead of hello!

We call traffic signals / traffic lights ROBOTS

But my favourite word is "Toasty" - to describe the warm cuddly feeling when your warm and "Toasty" under your "blankie" in the bed