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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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4
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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