I thought "say hello to" can only be used when being introduced. What's mean here?

Native speaker’s answer
Rebecca
Good question! The expression is used colloquially in this case. Someone can use "say hello to + [something]" to introduce an object, topic, person or even themselves in a theatrical and impressive way. Ex: I just got promoted. Say hello to the new manager! (The speaker is the new manager) Ex: Our company finally got an investor. Say hello to a new successful startup!