我是宇宙全球无敌大逗比
[wŏ shì yŭ zhòu quán qiú wú dí dà dòu bĭ]
This translates directly to 'I am the greatest funny person in the universe' and is typically a playful, exaggerated way to describe oneself as extremely humorous or goofy, often used among friends as a casual, self-mocking humor.