谢谢 (xiè xiè): to thank, or thank you
老板 (lǎo bǎn): boss
谢谢老板 (xiè xiè lǎo bǎn): “Thank you, boss.”
In day-to-day use, whoever you’re saying this to doesn’t necessarily need to be your boss. It could be anyone who has given you something nice, or done you a favor.