When school consists of two parallel courses that must be completed in tandem, a person habitually puts one off in the exclusion of the other. This backfires when one course can go no further until the other has caught up. This causes stagnation.
Primarily used in a school setting, but can be applied in business or professional with two projects or courses of action.
Did you hear about Joe? He pulled a puckett with his English requirement. Now he's stuck again, just like he did with Legal.
Now don't go pulling a puckett again!