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1.
A purported "gang" with chapters in several Puerto Rican middle schools, mostly composed of seventh and eighth graders. They are generally characterized by arrogance, self-righteousness and disrespect to others, even those above their own age. This defiance to the social order of the school is usually not appreciated by high school students, especially upperclassmen.

Other defining characteristics of the "T-Unit," as they like to call themselves, include verbal and physical abuse of sixth and seventh graders and freshmen, mouthing off to teachers and older students, and chauvinistic attitudes celebrating their masculinity, even though some members conform to the stereotype of a "nerd" or "geek" (i.e. glasses, short, out of shape, etc.)

Apparently based on popular hip-hop groups such as G-Unit and Murder Inc.
John: "You heard? The Terror Unit beat up a freshman yesterday."

Mario: "That's not right, man. We've got to find some way to get rid of those little idiots."
by The Red-Hatted Plumber April 13, 2006
 
2.
A purported "gang" with chapters in several Puerto Rican middle schools, mostly composed of seventh and eighth graders. They are generally characterized by arrogance, self-righteousness and disrespect to others, even those above their own age. This defiance to the social order of the school is usually not appreciated by high school students, especially upperclassmen.

Other defining characteristics of the "T-Unit," as they like to call themselves, include verbal and physical abuse of sixth and seventh graders and freshmen, mouthing off to teachers and older students, and chauvinistic attitudes celebrating their masculinity, even though some members conform to the stereotype of a "nerd" or "geek" (i.e. glasses, short, out of shape, etc.)

Apparently based on popular hip-hop groups such as G-Unit and Murder Inc.
John: "You heard? The Terror Unit beat up a freshman yesterday."

Mario: "That's not right, man. We've got to find some way to get rid of those little idiots."
by The Red-Hatted Plumber April 28, 2006