Any of a number of possible repellers or absorbers (i.e., a sheet of plastic wrap, towel, T-shirt, underwear, magazine, etc.) that is placed on a laptop keyboard to protect it from ejaculate when one is having video sex with an online partner.
I was videosexing with my girlfriend on Gchat, so I snatched my boxers for a keyboard condom over so it wouldn't short out after I screencreamed.
A silicone protector that prevents crumbs from getting into the keyboard. Normally it is removable and washable.
dude your Keyboard Condom is getting pretty dirty, maybe you should clean it.