The 5th quarter is slang for the fight that happens between the two teams and sometimes their fans after a football or basketball game. It is called the 5th quarter because it happens after the 4 quarters of the game been completed and the result is final.
When I was in school we had a really bad basketball team. We lost all 4 quarters of the game but we made sure we won the 5th quarter.
by marx99 June 20, 2019
Everyone was so pumped we won the game, so at 5th quarter we threw buckets of ice water on the football players.
by Drocr September 10, 2007