In slang, crop-dusting is the act of moving while passing gas, usually silently, thereby “dusting” other people or an area with the gas.

Why do crops get dusted?

They help protect soil and water quality. During the middle of the year, they might be applying pesticides.

What does crop dusting a table mean?

For those of you unfamiliar with the term, "cropdusting" is when a server walks by a table, timing their approach just right to unleash a noxious blast of ass fumes.