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The Chong version of the word "pendejo" meaning Dumb Ass in spanish...It is used in the movie Cheech and Chong's "Up in Smoke"
Chong: Hey Pentacos...hey pentacos!

Cheech Hey don't say that man...don't say that
Chong: Pentacos! how you doing pentacos!
by MIJOZARA September 22, 2010