Green’s Dictionary of Slang

1. (US) talk.

1914		G.A. England ‘Rural Locutions of Maine and Northern New Hampshire’ in DN IV:ii 83: yip, n. Noise, talk. ‘Hold yer yip!’ i.e., be quiet.
1933		C.G. Booth ‘Stag Party’ in Penzler Pulp Fiction (2006) 95: One yip and I’ll blow you in two.

2. (US Und.) a dog.

1927

in ‘Jargon of the Und.’ in DN V.

3. (US Und.) a complaint.

1933		Ersine Und. and Prison Sl.
1971		Shankar’s Weekly (Delhi) 4 Apr. 5/1: In the old days, there would have been a spate of..discussions... But today? Not a yip [OED].