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Means, to be ignored or overlooked, not paid their respect (or disrespect) when an effort is made by a person or group of persons. Usualy refers to underground hip hop but not always.
'It ain't right that Nas always be slept on by today's radio and tv stations' =
by Adrian October 10, 2006
overlooked; forgotten, ignored.
"He slept on the cd so i scooped that shit up."
by iq December 02, 2002
To be underated or over looked.
That fucking Too Short Cd was slept on but that shit got some dumb ass slap.
by Marquis Lee February 25, 2004