Mexican Crop Duster Share definition Flag A follow up to a dirty sanchez, when one cleans off the remaining fecal matter with a forceful ejaculation. I can't believe Charlie did a Mexican Crop Duster on Jenn last night! Mexican Crop Duster by chuckinator January 2, 2009 0 0 Get merch Get the Mexican Crop Duster mug. Buy Now — $32.95 See more merch