Green’s Dictionary of Slang

a transsexual.

1972		B. Rodgers Queens’ Vernacular 201: TS transsexual.
1982		Maledicta VI:1+2 (Summer/Winter) 135: The slanguage of sexual minorities [...] boy lovers, TVs and TSs.
1988		H. Max Gay (S)language 43: TS—transsexual.
1998		R. Scott Rebecca’s Dict. of Queer Sl. 🌐 transsexual or TS — a person whose birth sex is viewed by hir as incorrect or incompatible with hir image of hirself, and who takes steps (including but not limited to physical and/or hormone therapy, and surgery) to make hir outer self match hir self-identification.
2003		K. Cage Gayle.