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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.
sleepin' by DarkNova December 18, 2001
Being knocked unconscious during a physical altercation.
Bob: Steve was sleepin' after the fight!

John: Whoa, he hot knocked out?
sleepin' by Chiefy Jackson November 30, 2017
it means sleeping, being asleep, in the act of sleeping
sleepin' by Richard Garcia January 29, 2003

Sleepin’

When one has hot sex and engages in heavy drug use after a long day’s work.
Yo Dylan, where’s Kenny?
Bruh, he went to Jessica’s house after his shift at Wal-mart. He’s sleepin’.
Sleepin’ by Marty McNasty November 7, 2020

sleepin on me 

Ignoring/not paying attention
These boys be sleepin on me since the 7th grade
sleepin on me by Gucciganggigi January 7, 2018

Sleepin' Yo Talk 

Sleepin' Yo Talk - when one or more people are acting stupid and or "trippin'"
Person 1 - " Bro are you stupid cause yo head shaped funny asf!"
You - "Bro i dont wanna hear it cause it sound like to me, you sleepin' yo talk right now"