Tsa Tsa Tzu is an expression that was used in sex and the city; an american sitcom about four adult women living in new york. Tsa Tsa Tzu is the feeling that one gets when they see the person they love. It's like getting butterflys in your stomach, or churning. Tsa Tsa Tzu was a kind of "test" to see if you still had feelings for the person. Hence, if you did not get tsa tsa tzu, you no longer had attraction to the person.
"everytime i see him, my stomach flips. talk about tsa tsa tzu"