a very deep sleep in which one will not wake up under any circumstance. Profoundly oblivious and unaware of anything as they sleep.
I threw a rock at chris's head but he didn't wake up because he has retard sleep
by mike in oxford October 26, 2008
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Making weird noises and excessive drooling while asleep
"Matt, this pillow is drenched from your sleep retardation!"
by Stat-mobile January 07, 2020
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Making strange noises and drooling excessively while asleep
"Matt, this pillow is drenched from your sleep retardation!"
by Stat-mobile January 07, 2020
Get a sleep retardation mug for your boyfriend Manafort.