A take-off of the word mullet, originally meaning the famous 80's hair style.
Now in the new boo terminology the word muddit is in reference to any part of the head and slash or face. The word is highly contingent on the context of the sentence and therefore can have multiple meanings.
Lerk your mullit to the phone I need to speak with eyes!
To go about business in an orderly boo fashion so that one remains out of contact by all means for a substantial length of time. Consequentially a "Great White" lerk is one where the individual is out of reach for the better part of the day or multiple days.
I have been on the great white lerk for the past 24 hours!!