J-Spot is given to a person who's name starts with a J, and who is radical. The name is usually given to said person because they are the center of awesomeness, like a G-Spot. The name must be given to this person by a group of close friends.
The unfortunate stain left on a carpet when someone attempts to enter a room where two lovers are going for it like good 'uns... and coitus is suddenly interrupted at the critical moment.