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A Chicago Mustache is similar to a Dirty Sanchez, except the person giving the Chicago Mustache eats nothing but laxatives and corn the day before and proceeds to spray loose, chunky shit all over the face and upper torso of the person receiving it. Similar to a Manitoba Milkbag.
"Ryan was sleeping one night and I gave him a Chicago Mustache. There was corn everywhere."

"Bitch got mouthy, so she got a Chicago Mustache."
by 563er April 03, 2009
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