A "bad sport" is an English idiom. It indicates a person who does not go along with the group. He may be a whiner, may not want to take his fair share of some burden, or behaves in some other negative fashion in relationship to a group of people.
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99% of all sports are governed by rules and regulations pertaining to the smooth and fair running of the sport. Bad sportsmanship involves cheating to circumvent the rules in order to win. This could involve using illegal drugs to enhance performance. Other types of bad sportsmanship is the action of an athlete that is a display of anger or taunting of other athletes or game officials. Even off the "field of play" so to speak, it is bad sportsmanship to make false or slanderous comments in the news media about other teams or players.
When things don't go your way and you get mad. For example, if your friend wants to play a game and its not going how they planned and they quit, they are being a bad sport.
Be nice and it usually goes, "Be a good sport and go wash the dishes", or something like that.