To miss out on something because one doesn't realize it's full potential, usually used with the word 'on.'
Some artists aren't as well known as others, so people stay sleepin' on their music when it be really good yo.
by DarkNova December 18, 2001
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Being knocked unconscious during a physical altercation.
Bob: Steve was sleepin' after the fight!

John: Whoa, he hot knocked out?
by Chiefy Jackson November 30, 2017
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An addition to the bed that makes it so awesomely comfy and fabulous that you can't get out.
These pillows make the bed totally sleepinable.
by korewatastyfish January 17, 2012
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to sit on ones hand for at least 20 minutes before you masterbate. makes your hand feel like someone else.
I gave myself the sleepin' pussy.
by Andrew March 6, 2005
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