it’s 4chan’s trans community, their board was /lgbt/ and the joke was that there weren’t a lot of lesbian, gay, or bi people, it was mostly trans people, so instead of lgbt it was just “trans, trans, trans and trans” (hence /tttt/ instead of /lgbt/). It started off just as a joke about the over-representation of trans women on the 4chan /lgbt/ board.
it’s 4chan’s trans community, their board was /lgbt/ and the joke was that there weren’t a lot of lesbian, gay, or bi people, it was mostly trans people, so instead of lgbt it was just “trans, trans, trans and trans” (hence /tttt/ instead of /lgbt/). It started off just as a joke about the over-representation of trans women on the 4chan /lgbt/ board.
see: https://en.wiktionary.org/wiki//tttt/