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When a person attempts to sing a song's lyrics but is only able to sing the more memorable parts and just mumbles the rest as part of the tune in a non-sensical fashion.
"comin' outta my cage and I've been doin' just fine, do-do-dododo dododo, it started out with a kiss how did it end up like this, it was only a kiss it was only a kiss"

"What was that?!"
"Just murumbling"
by Michael Ronan July 18, 2009
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