Infamous Irish gang based in the Sunset district of San Francisco, CA. Known to, when provoked, beat people to death, especially Asians. Also known as "the Tribe". To "T.N. it up" refers to causing trouble with other TNT members (T.N.'s).
"The Tribe kicked some Chinaman's ass last night"
"Don't step to the TNT"
"Yo, let's go T.N. it up"