Crop spraying - explosive diarrhoea in which one decorates the toilet bowl with fart art in much the same way as a farmer sprays dung onto his field
Doctor to patient: "ah yes, its Mr Smith isnt it? So how are the bowels today, are we crop spraying or cable laying?"
by Martin Duxon July 17, 2003
Similar to Crop Dusting, Crop Spraying is when one passes gas while walking or running but accidentally expelling excrement as well through one's trousers.
Brad: "I was going to crop dust my little nephew when he was bending over to pet the dog but I accidentally ended up crop spraying them and coating them both with thick diarrhea."
by CATFOOODS January 18, 2012