ETYM For older lanterloo, French lanturelu, lanturlu, name of the game; orig., the refrain of a vaudeville.
(British slang) The toilet.
(Homonym: lieu).

An old card game in which 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

To obligate to contribute to a new pool at loo for failing to win a trick