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A euphemism or innuendo relating to people who play in the lower brass section of the orchestra.

Applies solely to people who play the trombone, euphonium, baritone and tuba.
Girl: I like your tuba, is it full sized?
Boy: Gosh, that's a real euphoniumism!
by Nopseudonymisgoodenoughforme February 14, 2011
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