Zarting is the act of telling your opinion about something you totally have no idea about, so instead of saying I don't know you start improvising and zarting about the topic
Dutch racial slur to describe a negro, literally meaning "giant black one". Became famous due to a video on Dumpert where a negro harassed an older woman in the city of Dokkum by asking her if he could have sex with her, the woman's reply (in a heavy Frisian accent) included the slur.