When one doctor puts or adds him or herself as a patient to another doctors already booked schedule last minute .
It can also be used when one doctor adds a random patient to another doctors already booked schedule with short or no notice .

It can be applied to other professions as well whereby a colleague calls in a favor and adds oneself or a another person they know to a fully booked work day schedule . Example : attorney or talent agent .

When you eat dirt for the first time and leave your family to build a shack in the woods