Ketchup and Mustard mixed together. This used to be a popular dip for french fries and several other dishes until about the year 2005. Now Mayochup is being eaten on everything including french fries.
People used to be fans of Ketchustard before 2005, now everybody despises Ketchustard and loves Mayochupinstead
Someone who after doing copious amounts of cocaine becomes super paranoid and thinks that everyone is out to get them. Frequently happens to heavy users and retards. Sketchtardness is contagious and can be passed to others, thereby making it a buzzkill as well. If you see or are hanging out with a sketchtard slap them immediately, or distract them by doing karaoke to Vanilla Ice "Ice Ice baby..."
Tim: "Holy fuck is that a cop car?"
Jim: "No assfuck its a carola, stop being such a sketchtard and lets do another lizzle."