What is a pickup game?

Answer 1

Pick-up games are loosely organized, multi-player activities that are open to everyone, and typically played among friends or new acquaintances. This includes activities such as Basketball, Chess, tennis, etc.

Websites like stickychicken.com facilitate pick-up games.

Answer 2

I am pretty sure a pickup game is a game hosted by someone for fun. This can be a hockey, football, or really any sport. It can also be a card game or something but most of the time it will be a sport.