Well, the "Chin" part comes from Chinese. Is it really such a stretch to see where the word comes from?

The term 'chink' comes from the phrase 'chink in the armor' which refers to a weakness in an otherwise strong fortification. In ancient times, Chinese warriors had the ability to shrink themselves down to the size of fleas or gnats and infiltrate enemy armor, causing unbearable itchiness and thus incapacitating and demoralizing the enemy while they tried to rid themselves of the terrible itch. Thus, the word 'chink' became synonymous with the Chinese because they were the only ones in the world who possessed this ability. In later times, people forgot where the term originally came from, and now we incorrectly apply it to anyone who looks remotely Asian, a fact that our brave, itchy ancestors would bemoan if they were to know. That, my friend, is the true origin of the word chink.

thanks for everybody treasuable answer

This reminds me of a heading in the Daily Telegraph about Chinese politics: Too Many Chinks In Socialist Armour. There you have it!

well chin comes from china. the thing about language is that when you see people from certain region you generalise those people from that region. It may be racist and maybe not racist depending on context it is spoken in. like people in india from south india are called madarasi or southi, people from china, japan or north eastern indian region and other places(who look like chinese) are called chinka(male) and chinki(female) so nothing to feel bad about it, just something to be proud of P.S. and as for racist well they are morons