Knock-Out Artist

Someone in prison who waits until their cell mate falls asleep. Once asleep, the Artist knocks them unconscious and proceeds to rape them violently.

“They call me The Original Knock-Out Artist. Pass out in my cell and I’ll turn that ass into a Penitentiary Picasso!”

Knock-It-Out-Of-The-Park-Er

A person who succeeds at everything they do.

Me: I love Paul Allen! That guy right there is a real knock-it-out-of-the-park-er!
You: Yeah, I hate him.

Knocking out a skeleton

When you have been locked down for so long you have literally turned your dick into a skeleton, have no feeling left, and cannot complete the task, due to the lack of sex from too much wanking

I wish this Lockdown would finish

Why is that?

I've started knocking out a skeleton

Dude that's bad, you can't even try the stranger in that situation!