Green’s Dictionary of Slang

(US) a black person.

2001		PBS Online Newsletter 🌐 ACTOR ONE: So we do understand each other here? You’re a titsun? ACTOR: Excuse me? ACTOR ONE: Charcoal briquette, a Moulin yan.
2004		L. Manfredo ‘Case Closed’ in Brooklyn Noir 210: ‘She a dit-soon?’ ‘A what?’ McQueen asked. Rizzo shook his head. ‘Is she black?’.
2006		www.jumptheshark.com 🌐 Being an African-American, even I am not offended by the so-called ‘Racist’ remarks. Yes, I have heard the words ‘Ditsoon’ and ‘mulignan,’ and all I do is just laugh it off.
2017		D. Winslow The Force [ebook] Anyway [...] the wops won’t be beating up any deadbeat ditzunes out on Lenox.