This is alludes to the fact that sometimes when you drink a lot at night, and then go to sleep you find yourself wide awake several hours later unable to fall back asleep. Sometimes referred to as the Liquor Rooster... however, this name is not as much fun to say.
I drank so much last night, but at 4 am the Liquor Cock woke me up, and I it took me three hours to fall back asleep.
by RCPB July 29, 2013
Get the Liquor Cockmug.