Phat is a slang word that young people, especially in African American English and then in hip-hop, used to mean fashionable, attractive, or really good — a phat beat, phat shoes, a phat rhyme. It is a playful misspelling of fat. In that slang, fat was already being used as praise (a fat contract, a fat beat: thick with goodness), and someone added the h on purpose.

Phat is a slang wordPhat是一個俚語 that young people, especially in African American English and then in hip-hop年輕人——尤其是非裔美國英語，後來也在嘻哈文化裡—— used to mean fashionable, attractive, or really good用它來表示時髦、有魅力、或很棒——a phat beat, phat shoes, a phat rhymea phat beat、phat shoes、a phat rhyme。It is a playful misspelling of fat它是fat的一個玩笑式拼錯。In that slang在那個俚語裡，fat was already being used as praisefat早就被拿來當讚美用 (a fat contract, a fat beat: thick with goodness)（a fat contract、a fat beat：滿滿都是好東西），and someone added the h on purpose後來有人故意加了個h。

It is informal, marked, and you would not put it in a school essay.

It is informal, marked它是口語、有標記性的用詞，and you would not put it in a school essay你不會把它寫進學校作文裡。

Though actually, the word has aged in the open. Many younger speakers now use it only as a joke about the 1990s, and outside that music world it can land as a typing mistake.

Though actually不過其實，the word has aged in the open這個字已經明顯地變老了。Many younger speakers now use it only as a joke about the 1990s現在很多年輕人只把它當成調侃1990年代的玩笑話，and outside that music world it can land as a typing mistake而在那個音樂圈子以外，它可能會被當成打字打錯。

It has nothing to do with body size in this meaning, even though that is the joke. If you need “overweight,” write fat, or a kinder phrase; if you need “excellent,” a living word will be understood more widely now.

It has nothing to do with body size in this meaning在這個意思裡，它跟體型一點關係都沒有，even though that is the joke儘管那正是這個笑話的哏。If you need "overweight," write fat, or a kinder phrase如果你要講「過重」，就寫fat，或用比較委婉的說法；if you need "excellent," a living word will be understood more widely now如果你要講「很棒」，現在用一個還活著的詞，會被更多人聽懂。