1. (Noun) A Low Brass instrument that is commonly mistaken for a baritone. Although it plays very similar to a baritone; it's major difference being the conical bore. Euphoniums play in either bass clef or tenor clef, provided the player can read. In regards to the Low Brass section, they tend to be loners within the section. Very similar to mellophone and french horn players in High Brass. Euphoniums are high quality instruments, most times, played by musicians that are versed with several instrumnts.

Most euphoniums are made using traditional techniques. You take a poon tang-brass metaloid melted down using focused sun light and cool it into individual pieces using a compressed ocean breeze. It is then stored under the Southern Ocean so that the pressure compresses and tempers the metal. Euphoniums not made with these techniques are not traditional and should be avoided at all cost.
Those euphoniums are awesome backing up the trombones.
by PDC1398 March 2, 2015
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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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A very talented sexy musican who is a natural born kisser
That euphonium player is a sexy beast
by talented man August 8, 2015
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When you pick up a girl, ram her vagina, attempt to stick the small end of a euphonium mouth piece into her nipple, and continue to play on the mouth piece, representing her body as a euphonium.
Yea man I gave her a Rusty Euphonium.
by snappyboi November 28, 2017
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Euphonium is basically a tuba, but instead of being a god-like instrument, they decided to make it bad.
Guy#1: Hey, do you know how cool the tuba is?

Guy#2: Yeah?

Guy#1: Let's NOT make the euphonium like that.
by Lord Squidward March 8, 2020
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Absolute worst instrument in the world, go play tuba, or any other instrument. This crap is the worst instrument to start on. If you play this instrument, switch to tuba this instant.
Look, this dude is playing the euphonium, sounds like crap
by goeatsomething December 3, 2020
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