Green’s Dictionary of Slang

aggie n.2

[? generic use of the female name]

1. (US gay) a homosexual sailor.

[US]B. Rodgers Queens’ Vernacular.
[US]R.O. Scott Gay Sl. Dict. 🌐.

2. (S.Afr. gay) gossip.

Isaacs & McKendrick Male Homosexuality in S. Afr. 247: aggie, homosexual gossip [Simes:DLSS].
[SA]K. Cage Gayle.