When you have your tv on even though you aren't watching anything.
Usually whatever you're wallpaper tv is requires no attention span and has no plot.
wallpaper tv is..
-Tv guide channel
-Any movie you've seen 2 or more times or is more than 7 years old.
-Whatever comes on after something you where actually watching.
-repeates that get shown 900 times a day (friends, madtv, anything on tvland,ect.)
person 1:"Dude, why are you watching an E True Hollywood Story of the cast of Happy Days?"
person 2(has headphones on, doing something other that watching tv) "Huh? oh, it's wallpaper tv."