A Klondike Bar is when a black top takes whoever he plans on having sex out into the
snow or
cold during the winter naked. He then forces them to
bare the
cold and pleasure him, the thought of frostbite and hypothermia keep the bottom from taking his time meaning the top never has to worry about blue balls, except from the freezing conditions. The top when finished jizzes onto himself and his partners bare
skin and returns inside to the warmth. The klondike bar part comes in from the fact the black dude is most likely now frozen and had a creamy center that is now on both members of the sexual act