The phrase Alexander der Geile is German slang built around the name Alexander, with geil used in its colloquial sense of cool, awesome or cheeky rather than in a formal translation. Short name based clips like this spread on user generated soundboards where they are shared as inside jokes between friends, especially when someone in the group actually carries that name. Its appeal stays personal and repeatable, which is why it keeps being reused for introductions, reactions and playful teasing online instead of as a standalone song.