A word used to describe a person who is loud, annoying and never shuts up. Usually someone who isn't very smart.

Pronounced: mel-o-jon.
That girl never shuts up, she's such a melodeon.

That boy is always talking shite. He's an awful melodeon.
by Mollsols March 21, 2014
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Irish (Hiberno-English) expression, describing something that is very bad, in bad condition or not very good.

Pronounced: malo-jen

Etymology: Melodeon is a type of button accordion.

Related: catmalogen.
The pitch has been absolutely melodeon.
by catmelodeon November 29, 2018
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