The practice of engaging in flatulence while in a crowd or line of people and then immediately moving through the crowd or line in such a manner as to spread the trail of fecal particles for optimum inhalation by all.
"Elevenpeople upchucked in the hallway after Bill crapdusted the entrance to the comedy show. A magnificent, high-hobopower crapdusting that will be remembered for years."
The act of starting at one end of a person-filled room, ripping a nasty fart (the "thick" ones are better, as they cling more), then moving briskly to the other end of the room, staying ahead of your own stench, yet "dusting" the rest of the room with your flatulence.
I quickly went out the door to avoidblame after cropdusting the room.
wes decided to cropdust the entire back half of the apartment, so he walked from the laundry room through the living room into the bedroom, all the while farting and pulling the smell with him.
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).