Shimakaze is a destroyer ship girl from Kantai Collection, a Japanese franchise that began as a browser game and later expanded into anime and other media, where her quick, cheerful personality made her a fan favourite. Short reaction lines like this one are easy to reuse because they need no context, so they circulate widely on soundboards, in memes and in fan edits. It sits alongside other short anime reactions such as anime ahh and anime ahhhh, and it remains useful because a single surprised syllable can punctuate almost any unexpected moment.