2 definitions by A.O.A
Person who has blisters and sores on their thumbs because all they do is sit around all day and plays video games
Girl: Your brother is always in the house. And his thumbs are all nasty.
Boy: He's a thumber.
Girl: Oh! How could I not know!
Boy: He's a thumber.
Girl: Oh! How could I not know!
by A.O.A January 5, 2004