Green’s Dictionary of Slang

now you’re shouting phr.

[emphatic var. on now you’re talking under talk v.]

(US) now you’re saying something meaningful or relevant.

[US]Scribner’s Monthly Nov. 142/1: Said he, perversely, ‘Now yer shoutin’!’ [DA].
[US]J. London ‘And ’Frisco Kid Came Back’ in High School Aegis X (4 Nov.) 2–4: ‘I’ll reward ye,’ sez he. ‘Now yer shoutin’,’ sez I.
[US]W.M. Raine Bucky O’Connor (1910) 214: Now you’re shouting. That’s what I’d like right well to know.
[US]F. Hurst ‘Boob Spelled Backward’ in Humoresque 225: Now you’re shouting!
[US]W. Smith Bessie Cotter 180: ‘I’ll buy a drink.’ ‘Now you’re shouting.’.