An absolute vlaka of a person, but they’re so vlakery that you can’t even waste the time of day to finish the word “Vlaka” so you have to shorten it to “vlak” just for your piece of mind.
When you want someone to piss off so badly, and you want them to get away from you so fast, that you can’t even finish the phrase “piss off”, just so they can get out of your sight.