/tg/

4Chan's "traditional games" (i.e. D&D, Monopoly, etc.) board, occasionally called /d/-lite by its denizens and other 4Chan boards. A place where trolls troll other trolls and some people will insist that using coasters is the only thing that separates "normal" people from mass-murderers

tg meaning together

used by unpolite French. It means "ta geule"( = STFU )

short for TOO GOOD
also commonly seen as tgtgtg

Together

Acronym for Teen Girl Squad of homestarrunner.com fame.

Has multiple meanings:
-Short for "Thank God"
-And the less known meaning, shorthand for the fetish known as "transformation of gender" which is most commonly seen on sites like DeviantArt and FurAffinity. Discovering TG art or fiction is usually the first step in someone realizing that they are transgender.