The act of walking past somebody, and without their knowledge, letting out a fart as you pass. Thus creating the crop dusting effect. Very effective in announcing your presence, or maximizing the devastating effect of your discharge.
*Loud fart*
*guy turns around*
guy 1: did you just crop dust me?
guy 2:....yes
guy 1: that was a good crop dusting.
guy 2: damn straight.
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