This line comes from gaming culture, where calling yourself a noob is a familiar way to raise the stakes before a difficult play. Short self-challenge clips like this spread through gameplay videos, streams and short-form edits because they create instant tension: the viewer knows the player has just dared himself to succeed. Even without a single confirmed original video, the phrase works because it is instantly understood by players, and it keeps being reused whenever a creator wants a quick setup for a win or an embarrassing miss.