(countable, dated, uncountable) A transgender person.
Often, TGs are forced to revert to their original gender in order to obtain services. 1997, Nancy Goldstein, Jennifer L Manlowe, The Gender Politics of HIV/AIDS in Women:
(abbreviation, alt-of, countable, initialism, uncountable) Initialism of temporary gentleman.
you can get rid of a man you don't like by writing a letter of introduction and putting him, with it, into the train. TG's are best treated thus. 1888, Rudyard Kipling, 'A Friend's Friend', Plain Tales from the Hills, Folio Society, published 2005, page 176:
(abbreviation, alt-of, countable, initialism, uncountable) Initialism of transformational grammar.
Hitherto, the Centre had cleared a proposal to allot the letters TG to Telangana State, but now the Transport Department has written to the ... 2014 June 3, “KCR wants TS instead of TG for vehicle registration”, in The Hindu:
The Southern region encompassing Andhra Pradesh (AP), Telangana (TG), AP and TG (two combined projects in both states), Karnataka, Kerala,[…] 2020 September 18, Sandeep Kumar, Ram Swaroop Meena, Manoj Kumar Jhariya, Resources Use Efficiency in Agriculture, Springer Nature, →ISBN, page 527: