simple past tense of that's that

(US, Canada, slang, vulgar) Used to express rejection of or objection to something.

(colloquial) Used to show agreement; indeed.

Alternative form of you can catch more flies with honey than with vinegar

(simile) Unquestionably dead / (simile) Extremely old-fashioned.

Used to ask someone to repeat something

Used to emphasise a particular quality

Used to ask someone to repeat something / (cricket) Used to make an appeal to the umpire as to whether the batsman is out or not / Used other than figuratively or idiomatically: see how, is, that.

(UK, informal) A very large number.

A card written as a thank you to someone, usually in response to receiving a gift or having been invited to attend an event.