This is a very informal masculine way of saying that you need to use the bathroom in Japanese.

Don't be surprised, though, if you're chatting along with a Japanese tourist, and he happens to tell you, "Excuse me for a second. I'm a toilet." In this sentence, boku means I, and toire means toilet, and wa is just the subject particle. So "boku wa toire" literally translates to "I am a toilet."

Bull. Since there is no verb, the sentence just says "I, toilet", and the listener is expected to deduce " going to the..." from context. Things like that are very common in Japanese, especially sentences without a subject are quite normal. This makes the language a bitch for translation engines.

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