sleepy cosby

A drink ordered at a bar or made at a party that is intended to get the intended consumer "sleepy". One part whiskey, 6 parts Nyquil.

Barkeep! Sleepy Cosby's all around!

Friend: "What happened to you last night. You went to get a drink then I didn't see you for the next 12 hours."
Me: "I mixed up our drinks. I gave you the beer and I drank the sleepy cosby."