From Longman Dictionary of Contemporary Englishlooloo /luː/ noun (plural loos) [countable] British English informalDHTOILET a toilet I need to go to the loo (=use the toilet).
Examples from the Corpus
loo• He says that Dodo often uses a shoe as a loo.• It was like being in a loo that rose and fell.• Then I took my bag into a loo and took everything off and changed into clean clothes.• All rooms are comfortably furnished and have their own shower and loo.• In the Legion, there was no guarantee that a man had even used a flushing loo before.• So far, she'd just flushed the smack down the loo and shoved the syringes in the bin.• Sybil papered the loo with that article and others.• A door closed, taps ran, the loo flushed.go to the loo• So I had a slice of pie and then he put the kettle on for coffee and went to the loo.• They'd gone to the loo together by the time I joined Bunny.• It is hard to stay awake but I had to keep going to the loo!• I do not have five roubles, therefore I can not go to the loo.• I had to go to the loo.• Anything to do with going to the loo makes children laugh.• And at an age when five times a night normally means how often you go to the loo, too. 