Skrub
A scrub but with a k (skrub) is a sophisticated word that you use on the low of the low. They have to be a scab and annoy the f*ck out of you.

Example
Cooper: can i have 2$
You: sure
Cooper: ill pay you back tommorrow
1 Month later
You: just give me my f***ing money.
Cooper: mum they're bullying me.

Moral of the story dont be a cooper.
Cooper: can i have 2$
You: sure
Cooper: ill pay you back tommorrow
1 Month later
You: just give me my f***ing money.
Cooper: mum they're bullying me.

Moral of the story cooper is a Skrub