The act of sexually assaulting a cremated person with a penis. It is similar to chalking a pool cue, but a penis instead of a cue and a cremated person's ashes instead of chalk.
I heard your mother was cremated last week. I'll miss fucking her, but I guess I can still chalk the cue.
When your significant other takes out their glass eye and you gently insert the head of your cock into the socket in an effort to attempt a traditional "skull fuck" of some sort.
When Ron Jeremy met Sandy Duncan, he thought he might need a minute to chalk the cue.