A window licker who works with computers. See also windows licker for Windows specific screen licking.
Oi Kev you spag, stop being a screen licker and licking the screen!
That one guy who lacks the brain cells to know what soap and water does and instead licks his/her screen to clean it; A person beyond the level that we would call lazy; A person who is both extremely hygienic and unhygienic at the same time.
Your a screen licker?!? That’s disgusting!