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)
As a noun: "look at that TT." (referring to a mulleted gentleman)
This is commonly used in online games (such as Warcraft) by a player when something goes very badly or unlucky for that player.
Player A: T.T
Player B: Yeah, I can't believe you didn't see me.