Green’s Dictionary of Slang

1. (US Und.) an act of informing, a betrayal.

1831		‘Gallery of 140 Comicalities’ Bell’s Life in London 24 June 2/2: I know vots vot, and I’m snigger’d if I don’t come the ‘chirp’ – I harn’t had my ‘regglers’ for the last two ‘cracks,’ and hates vots dishonourable.
1920		F. Packard White Moll 72: Once we’re sure there’s no back-fire anywhere, the Sparrow will chirp his last chirp.

2. (US) a female vocalist.

1944		Cab Calloway New Hepsters Dict. in Calloway (1976) 254: chirp (n.): female singer.
1944		‘Jiver’s Bible’ in D. Burley Orig. Hbk of Harlem Jive.
1953		L. Durst Jives of Dr. Hepcat (1989) 7: Honey, whenever --- ankles on the screen he’s chock full of retchus beef and low ready with the chirps.
1978		L. Kramer Faggots 101: Restoring her quite miraculously to international chirpdom.
1989		H. Rawson Dict. of Invective (1991) 71: canary. A woman, sometimes a whore, and frequently but not necessarily a singer, a.k.a. chirp or thrush.

3. meaningless chatter.

1914		T.A. Dorgan Indoor Sports 18 Feb. [synd. cartoon] [heading] Dolling up for Your After Dinner Chirp.
1919		A. Baer Two & Three 4 Apr. [synd. col.] Chirp of the highbrows is no more Hofbraus.
1940		O. Strange Sudden Takes the Trail 171: An’ listen, another chirp outa you an’, well, it ain’t difficult to stop a baby’s breath.
2000		N. Barlay Crumple Zone 148: That was all just gab an’ chirp.

4. (also chirping) a taunt, a complaint.

1931		P.J. Wolfson Bodies are Dust (2019) [ebook] ‘And one chirp out of you, “Smirker,” and you make an appearance under your own name’.
1993		J. Small in Weekend Post 14 Aug. 1 n.p.: There was some more chirping, again he advanced and this time he walked inwards to the goalposts instead of straight forward to the tryline [DSAE].
1994		TV1 5 Mar. [TV] Another chirp going on there between the two of them [DSAE].
1994		J. Dewes in East Province Herald 25 Mar. n.p.: Student ‘was arrested for chirping’ [DSAE].

5. (US black) a song.

1942

‘Marienne’ ‘Solid Meddlin’ in People’s Voice (NY) 7 Mar. 33/1: Got a listen on Rollins Smith [...] puttin’ down a special chirp.

6. (US black) a telephone call.

2014

J. Leovy Ghettoside 170: He got a cherp from a girl he called ‘Hollywood.’ ‘A tramp just got chipped,’ she told him.