Based on the 11 hour 5 min match at Wimbledon featuring Nicholas Mahut (FRA) and John Isner (USA) where they played 138 games in the fifth set alone and where most records were completely shattered.
It refers to anything an event or oddity that will almost positively never happen again.
The strange disappearance of an entire civilized city in Mexico was a once a marathon match
Term used when someone is asking whether a person's pubic hair color matches the color of the hair on their head. This question is usually asked of a person with red hair.
Hey Charlie, I saw you went home with that cute redheaded chick from the bar last night. Did the carpet match the drapes?