When you send a message and the other person reads the notification but does not open the app or making any physical effort to reply. It means that even though the person who received the message may be active, they did not open the other person's message hence the person who sent the message will not be seenzoned. This is usually done to read the message and then later make up the excuse that you did not see it nor did you seenzone the other person
Guy 1: You see that girl over there? She's beautiful and thick
Guy 2: Yeah I see her, she's a big hoe don't take your chances
Guy 1: Then I'll unhoeify that bitch Guy 2: Once a hoe, always a hoe. But have fun trying