A woman who gets angry at a guy who blows his wad, then falls asleep or gets up to have a cigarettewithout even considering the possibility that maybe she was not done yet.
Someone who can't simply be honorable, by accepting defeat and/or trying again. On the contrary, said individual or group engages in childish pissing and moaning; bitching about how it's not fair and the other side cheated, etc.
Al Gore, Cynthia McKinney and John Kerry are all prime examples of winners. You won't find a single sore loser in that jolly little group! How ever on the other side Gustavo costa, Mattheus Prais and more are all sore losers