A keyboard coward is a type of Redditor that refuses to express their disagreements with posts, or comments within Reddit with their words. Instead, they would rather abuse the voting system within Reddit to mark their disagreement.
That user is a keyboard coward because they are incapable of forming their opinions into words. Instead this user uses down votes to show that they disagree with the OP.
by Nick Lotze December 15, 2015
by rorosita January 27, 2016