Mullet roe, a network term, namely? Speechless, expressing the meaning of being speechless, was wordless at first, and then developed into mullet roe. Zi is an modal particle, which has no practical significance. In the network language, it means that you don't understand something, you don't have a clue, or you are too lazy to say it, and you don't want to care about it anymore, that is, netizens encounter something that is speechless.