Tt is french and stands for tout wich means all or everything.

Noun or adjective
Trailer Trash. Can be used to refer to things that are of appeal to this demographic. Note that it is not essential for something or someone to actually be related to trailers or trailer parks for it to be TT, nor does having money or being rich preclude being TT, as TT is a state of mind. Used in conjunction with a deep-throated "yuuuup" to refer to the gutteral tough-guy voices often used by TTs (or given to them from years of smoking marlboros)

Acronym, usually on IM
'Till Tomorrow

Thottery Type Shit.

Like the shit them thots be doing.

Abbreviation for turntables. In the DJing world, turntables are referred to as TTs or decks

to pull a tt
when u play counter-strike and u flash ur teammates with a flashbang or teamkill ur teammate with a nade , u pulled a TT

short for saying,
"Tough titty says the kitty but the milks still good"..meaning tough.