Say this to start a conversation about a certain topic. Usually the topic is something exciting happening.
How about that new Samsung phone?
English speakers use this phrase for sports teams more than anything else, however. In fact, it’s used so often that it’s sometimes a bit of a joke: when people don’t know what to say, they say “How about those (name of a sports team)?"
How about those Tigers!
Depending where you’re from, you can add “huh?” or “eh?” at the end of your question, but you don’t need to add anything.