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' =[
When theperson you're communicating with pretends they are going to sleep to get off the phone with you so they can hangout with someone they like more.
I got fake-slept on by Nicole last night. She said she could barely keep her eyes and then ans hour later Jeff saw her at the bar with Ricky.