*guy turns around*
guy 1: did you just crop dust me?
guy 1: that was a good crop dusting.
guy 2: damn straight.
n. crop duster
1. on a treadmill (no matter how fast you walk or run)
2. with a strong tail wind
3. with a turnaround - for example, you crop dust while walking with your girlfriend, then she turns around and walks back to look at a display in a storefront window.