The manji 卍 is also used as an internet slang when you're hyped up, excited for something.
See the article about the usage of the swastika in Japanese for details. This article is just for examples of usage.
Manga: Kaguya-sama wa Kokurasetai ~Tensai-Tachi no Ren'ai Zunousen~ かぐや様は告らせたい~天才たちの恋愛頭脳戦~ (Chapter 82, かぐや様は断らない)
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