The remaining reisdue on your plate once you've eaten the main staples of your mexican food meal. Typically, it's multi-colored and consists of red sauce, cheese sause and quacomole.
"hey pass me the nachos, i need to scoop up this tasty mexicretion"

"Wow. After eating #19, there's about a pound of mexicretion on my plate"
by EpicAddict December 12, 2011

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