We found one dictionary that defines the word using the bathroom:

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1. using the bathroom: Wiktionary

▸ Words similar to using the bathroom ▸ Usage examples for using the bathroom ▸ Idioms related to using the bathroom ▸ Wikipedia articles (New!) ▸ Words that often appear near using the bathroom ▸ Rhymes of using the bathroom ▸ Invented words related to using the bathroom