The eight keys on a keyboard on which one is supposed to place his or her fingers while typing: A S D F (left hand) and J K L ; (right hand). See also homekey folley.
Most people don't use their home keys; instead they type with mainly their index and middle fingers roaming the length of the keyboard.
The one brother, out of a set of twins, who stays at home on his ass all day while the other one goes and and earns a living. Similar to a trophy wife.
Charlie just sits at home while Thomas wakes up everyday and goes to work. Charlie is a stay at home brother.