Why do people here like to use the term Paki so much?

Re: Why do people here like to use the term Paki so much?

What is the origion of this world?
Why did the word 'Paki' = dirty south asian?

There's got to be a reason?Why did not a word 'Indi" come up, instead of Paki.
I know only in the UK this means derogotery, not anywhere else in the world.