This clip is mainly known online as a short reaction meme rather than as a clearly documented line from a single famous source. It spread through meme edits, reposts and short-form videos where creators use it as a fast, exaggerated response to something extreme or impressive. Its staying power comes from how brief and readable it is: viewers immediately understand the tone, even in very short cuts. Variants in spelling, such as gah damn, gahdamn and gah dayum, also help it circulate across platforms and captions.