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A Mexican Pickle is when you preform oral sex with a person who's penis is extremely rancid and uncleaned.
I regret going down on my boyfriend last night, he had a Mexican Pickle.

Friend 1: "Dude, I can smell your Mexican Pickle from here."
Friend 2: "Sorry bro, I'll wash it when I get home."
by SillyRichard December 29, 2010