When someone is going down on an old broad and she accidentally shits herself.
Man, did you hear about Brad? He got a Dirty Gerty from Linda last night! That boy is still in the corner shaking and crying.
A person known for constructing, planning, or generally doing things half-assed.
The word is derived from an individual who performs tasks in a "shabby" manner. The suffix Zulu has added to define the "afro engineering" aspect said individual applies to most tasks/processes.
"I see Shabby Zulu decided to paint his car with Krylon."