To tell someone to use their imagination. In effect, most people, at least normal, non-homoerotic sadists, wouldn't know what a split cock looks like, so they'd have to use their imagination.
"Hey Jimmy, I heard that there's going to be a comic book about gay school children trapped in Hell, what do you think that'll be like?"
"Splitcock."
"What?"
"Use your imagination fucktard."
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.
We have a Zoom meeting in a few minutes and I’ll probably go pajama casual.