What is apropos of nothing meaning?

"Apropos of nothing" is a phrase used to indicate a remark or comment that seems unrelated to the current topic of conversation. It can also be used to introduce a topic that is not directly related to the current discussion. Essentially, it means "with respect to or concerning nothing in particular." It is typically used to inject humor or levity into a conversation. The phrase originates from the French "à propos de rien."