Take a dump.
He went outside and did his business on the lawn."Don't do your business in there!"
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"Voosh" is the sound of a joke going over someone's head, and once it has been explained the result is an "unvooshing".
"Oh, I get it now. Unvoosh." voosh
Genitals/balls/taint/scrotum
"Wham, right in the tender business."