Green’s Dictionary of Slang

1. (US) the Thunderbird, a motorcar.

1961		J. Flynn Action Man 45: The Merc sedan, two down from your Bird [HDAS].
1972		G.V. Higgins Friends of Eddie Coyle 84: The Kraut spotted Dannie Theos the other day in a big maroon Bird.
1975		L. Dills CB Slanguage.

2. (US black) Thunderbird wine.

1970		A. Young Snakes (1971) 75: A sweet taste of Bird.
1993		J. Mowry Six Out Seven (1994) 148: A red-eyed man in dirty shorts lurched halfway out of the other apartment’s door. A bottle of Bird dangled from his fist.