Green’s Dictionary of Slang

(US black) to talk in a way that confronts or embarrasses one’s hearers, that is deliberately antagonistic; thus loud-talk n.; loud-talking n.

1927		H. Yenne ‘Prison Lingo’ in AS II:6 281: To loud talk a person—To speak in a loud voice about the person within the hearing of a guard, for violation of rules.
1937		Z.N. Hurston Their Eyes Were Watching God (1998) 151: Dey can’t come runnin’ over nice people and loud-talk no place whilst Ah’m around.
1967		F. Salas Tattoo the Wicked Cross (1981) 235: Whatever you do, don’t let the dude loud-talk you into fighting until you got the blade.
1968		N. Heard Howard Street 217: It was time for a loud-talk session. [Ibid.] 220: It was a poor pimp whose loud-talking backfired on him.
1972		Mitchell-Kernan ‘Signifying, loud-talking and marking’, in Kochman Rappin’ and Stylin’ Out 329: Loud-talking requires an audience and can only occur in a situation where there are potential hearers other than the interlocutors.
1985		T.R. Houser Central Sl. 34: loud-talkin’ [...] ‘That shit ain’t rap, niggers be loud-talkin’.’.
1986		Eble Campus Sl. Oct. 4: loud talk – tell someone’s secrets.
2001		(con. 1975–6) E. Little Steel Toes 18: If you’re serious about violence you stay quiet, and Moppa’s not loud-talking at all. [Ibid.] 118: Listen up, peckerwood, you are [...] loud-talkin’ my friend, who out of the goodness of his heart offered to do this for you.