On these Puerto Rican kids with pistols
Doin sign language is twitchin noses

from Ghostface Killah (Ft. The Notorious B.I.G. & Raekwon) – Three Bricks Lyrics on Rap Genius

Meaning

These two Hispanic thugs mentioned earlier start twitching their noses and using subtle hand movements as some kind of code to communicate non-verbally with each other. Not discrete enough for Lex not to notice.

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