According to the search results, "loo" has two different meanings:

1. Bathroom/toilet: "Loo" is an informal term for a bathroom or toilet, used primarily in British English.

2. Card game: "Loo" is also an old card game in which players contribute stakes to a pool, and the winner of each trick or a majority of tricks takes a portion of the pool while losing players are obligated to contribute to the next pool.

The term "loo" is believed to have originated from the French word "leau," meaning water, and was originally an euphemistic allusion to the chamberpot.