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In germany it sounds like 'einen abseilen' aka 'to go to the toilet and dump one'

Technically, the verb "abseilen" just means "to rope down", but the collision with this idiom is rather unfortunate.

I am not sure how common that is, though. I am a native speaker and have not heard that expression before.

I don't think it is common to say it often but at least in Bavaria, people know this.