A term most commonly used in technology fields which describes the process of overcoming technological challenges by using spontaneous, irrational, and otherwise ignorant solutions that will most likely lead to much bigger problems in the future.
The email server went down again because the last systems guy that workedon it asshacked the configuration.
Similar to the idiom, "Wear Your Heart On Your Sleeve" but instead of expressing your emotions freely, you (or someone else) show how much of an asshole you are.
Cal: Yeah, so I punched him in the face for taking the last slice of pizza.
Rudi: It was his birthday, assjacket.