A person who is a simpleton, a tool, or a very simple tool. From the idea of the extremely simple tool, the T-square. Also, for idea of tool squared, that is, tool to the second power, with the idea of being a super-tool. Also, t squared, T2, tsquared, or t square.
Matt: "Ted gets off on looking at pictures of farm animals."
Gus: "What a tsquare"
A gaming legend known around MLG competitions who excels mostly in shooting based games such as Halo. The name t-square can also be used in verb form, tsquared. You use the verb form when a player has performed a certain action in the game which resembles tsquare's actions or incentives.
Duude did you see that? As soon as he walked through that door, I tsquared his ass.