What is 31th Base?
Didn't learn did you? This is the base reached when people realize there is no 31th base, its the 31st base... continue reading.
Bob: Dude, I totally got to 31th base last night.
Billy: Dude, there isn't a 31th base, its 31st, and there's no way you had actual phone sex... besides, that only works in cartoons.