Narga Sucia means Dirty Ass, used as a very demeaning insult. It's usually used in circles of hispanics when insulting each other.
-"Esta tipa tiene que lavarse las Nargas."

Using it in this way would imply the person that you're talking about is a Narga Sucia.

-"NARGA SUCIAAAAAAAAAAAAAAAAA!"
Also a common way to use this phrase.
by rollingtortilla January 1, 2012
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