Green’s Dictionary of Slang

1. a man with an uncircumcised penis; an uncircumcised penis.

1975		J. Wambaugh Choirboys (1976) 238: ‘A helmet or an anteater’ [...] ‘Circumcised or uncircumcised’.
1999		N. Stephenson Cryptonomicon 151: Anteater – not mushroom [...] He’s not circumcised, sir!
2000		Eble Campus Sl. Spring 1: anteater – see corndog – uncircumcised penis.

2. (US gay) an erect penis.

1989–2003

R.O. Scott Gay Sl. Dict. 🌐 anteater: Synonym for erection of the penis.