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The act of lubricating one's penis with creamy (preferably sweet) peanut butter, performing anal sex on one's partner, then licking the peanut butter off said partner's crack.

Note: To perform an Extra-nasty Juarez, one ends the act with a deep kissing session, making sure to leave the lingering taste of peanut butter on the partner's mouth. This is only done sometimes, in the heat of the moment, when it is forgivable to go ass-to-mouth.
I woke up with the taste of peanut butter on my mouth from doing a Nasty Juarez last night.
by The Jeffrey January 30, 2012