When you're about to sit on the toilet and you fart right before sitting down so that thefart cloud is at nose level, effectively giving yourself a cropdust.
The act of surreptitiously releasing farts into a high traffic area like a hallway so that the gas is whisked along with the unsuspecting pedestrian carriers. A role reversal of crop dusting achieving the same effect.
"Bro did you see the looks on those army joes walking by? I've been reverse cropdusting large groups that stroll past. They keep blaming randoms. I'm dying here"
When you use the TouchTunes app to play a song that completely changes the vibe just as you're leaving. Is the bar full of old people? Play some death metalon your way out. Family-friendly place? Throw in some WAP or 2 Live Crew just as you find the exit
Bill: "I need a drink and this family restaurant isn't working for me. Way too many toddlers and soccer moms."
Me:"I'll just TouchTunes Cropdust this place and play 'WAP'. Let's get out of here"
I farted and asked my friend John to come look at a meme on my phone, sharing the lovely flowery smell of almost shitting my pants, reverse cropdusting him.