An Emerson Unit defines the number of matches (Swedish standard) that need to be lit, and extinguished, in order to mask the smell of a fart.
This is similar to the Scoville Units, which indicate the number of drops of water to fully dilute the strength of a chilli.
That fart was so stinky it registered 10 Emerson Units! You need to lay off the cask beer man.
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