Top definition
The combining of two words:

lyric: "having a pleasing succession of sounds"

AND
-osis: "a disorder or abnormal state"
to mean when a person is singing and doesn't know or forgets the words to a song so they proceed to make up sounds and grunts to cover the fact that they sound like an idiot.
My sister and I got drunk last night and were singing Billy Jean loudly when I realized the bitch was suffering from lyricosis, she had no idea what the words were.

I love laughing at that dude that always sings for Karaoke even though he has such a severe case of lyricosis.

I don't care if I don't know the words to the song, a little lyricosis usually hides the mistakes.
by blonde_rosie May 25, 2010
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