The time of day that arrives when you show up at a bar or house party, and there's barely a chick in sight, except maybe a few fugly ones, and you have to leave and go somewhere where it's not a total sausagefest.
"Bad news boys, it's cock o'clock in here. We're gonna have to split and change locales if we want to sink the pink tonight."
A penis puppetry move in which the penis is brought across the top of the wrist, like a watch. You then get someone to ask you what time it is, to which you enthusiasticly reply 'cock-o-clock!!!'