A blank browser tab generally opened while viewing questionablematerial in another tab. Often switched to quickly if another person walks into the room, in an attempt prevent them from seeing what you were doing.
As Nathan watches porn he often makes sure he has a dummy tab opened in case his mom walks in.
“Hey, I need to ask you a question.” “Ya, what’s up?” “Ummm.. see that girl over there?, you think she thicc?” “Oh, that girl, oh no, she ain’t just thicc she DUMMY THICC!”