Chai is a Hindi word meaning "tea." So if you say "Chai tea," you're really saying "tea tea." 
And when you say "shrimp scampi", you're saying "shrimp shrimp".
I did not know that.
Cole Porter originally wrote The Tale of the Scampi.
Down by the sea lived a lonesome scampi,
Every day sitting moist and damp, he
Found his home life awfully wet ...