bird turd, v. — Green’s Dictionary of Slang

bird turd v.

[assumed but uncited earlier use of bird turd n.]

(US) to talk nonsense; esp. in phr. you ain’t just (a-)bird-turding.

1948		N. Mailer Naked and Dead 362: You ain’t just a bird-turding, Jack.
1960		J. Brosnan Long Season (1975) 96: Odd behavior? You’re not just bird-turding there, man!
1967		(con. 1950s) McAleer & Dickson Unit Pride (1981) 230: ‘With him it just comes naturally.’ Dewey said. ‘You ain’t just a-birdturdin’,’ said Coggins.