student asking question

What are No.1, No,2 or No,3?

teacher

Native speaker’s answer

Rebecca

"No.1" refers to urinating and "No.2" refers to defecating. "No.3" is somewhat of a made up term, and could refer to any kind of severe bodily function. Referring to these bodily functions as numbers is done to say them in a "polite" and indirect way.

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