chin-chin

noun

1. polite and ceremonious speech.
2. light conversation; chitchat.

verb (used without object), chin-chinned, chin-chin·ning.

3. to speak politely and ceremoniously.
4. to talk casually and lightly; chat.

interjection

5. (used as a greeting or farewell.)
6. (used as a toast, as in drinking to someone’s health.)

sentence substitute

1. informal a greeting, farewell, or toast