The act of drinking someone else's or your own urine. It is rarely used in times of dehydration, usually used when in a survival scenario (Bear Grylls). Often during or before sexual acts.
"Hey man i totally drank some chicks piss last night, it was awesome!"
"Thats pretty gross man, i dont think you should tell people that..."
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