Green’s Dictionary of Slang

(US) a bisexual.

1983		oral testimony in Lighter HDAS I 161/2: I was at a party in New Orleans in ’68 or ’69 and this huge guy started feeling my friend’s ass. This girl said to me, ‘Watch out for him, he’s a bipe.’ I said, ‘A bipe! What the hell is that?’ She said, ‘A bisexual.’.
2002		The-House-of-Love.org ‘Bisexual Names’ 🌐 ambisexual • AM/FM • bats and bowls • bi • bi-bi-baby • bi-curious • bicycle • bi-loving • bipe.