Motteke! Serafuku (「もってけ！セーラーふく」) is the opening song to the anime Lucky Star, sung by Hirano Aya, Katou Emiri, Fukuhara Kaori, and Endou Aya. Much like Hare Hare Yukai, the bulk of the animation sequence for Motteke! Serafuku features dancing.
On Danbooru, this tag refers to images that reference the opening animation.