To avoid doing work while on the clock whilst taking care of one's needs. Less euphemistically: to jack off at work.
I was feeling really stressed at work today, so I locked my office and closed the blinds for a good ol' shirk and jerk to relieve my tension before the board meeting. Totally killed the presentation!
A way of neck-fucking someone by having them shrug their shoulder whilst you slide your dick in the space between the shoulder and side of head.
For when you get a kink in your neck.
Alexis Texas, if it doesn’t feel good, why would you still want to shirk jerk me?