In the "Teenager" by "My Chemical Romance"...?

Question

what would be the meaning of "what u got under your shirt " ?

Answer 1

it refers to 'standing up for what u believe in and not giving a *** what people say' and rebelling against 'the man' (parents ect.)

/\/\CR to the death!!!!!!!

Answer 2

I think it refers to hiding a gun or a knife or something like that under your shirt.  I'm not completely sure though.

Answer 3

they're referring to a gun. the song is about how teenagers sometimes result to violence to solve their problems. at the end of the music video it reads "violence is never the answer"