The strained look on one's face while trying to open a pickle jar lid (or similar lid) which requires exerting substantial force. This look is often displayed by males when experiencing intense concentration during a sexual performance.
When Randy was caught having sex in the backseat of his car, he prominently displayed pickle jarface as he pumped the girl with determination.
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.